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/start returned as soon as flagd's /readyz reported 200, and treated that as "the seeded flag state is being served". It is not. flagd's file sync calls sendDataSync(), which pushes the payload onto a channel buffered to the number of sources, and only then setReady(true); the parse and store swap that make those flags evaluable happen afterwards, on the goroutine that drains that channel. Every source can therefore hand over its payload and flip ready without a single one having been applied, so /start could return while flagd still answered FLAG_NOT_FOUND for flags the configuration plainly defines. Measured against the v3.10.1 image over 40 starts, 14 of them (35%) left such a window, median 6ms and up to 32ms. A provider that blocks during its own initialisation absorbs the window and never sees it; a stateless provider evaluates the instant /start returns and races it, which reads as a catastrophically broken provider rather than as a racing testbed. The Go OFREP conformance suite went from 22 and 29 failures over two runs, with near disjoint failing sets, to the same 2 failures twice, both of them the known fixture gap that #392 fills. After /readyz reports 200, poll a real evaluation over OFREP until it resolves, within the existing 10s budget. The probe keys are derived from the flagd configuration being started, one enabled flag per file source, rather than hardcoded: the configurations do not all share a flag file, so a fixed key would not survive them, and the sources are merged into the store independently, so each needs its own probe. Disabled flags are skipped because flagd reports FLAG_NOT_FOUND for them too. No sleep and no blanket retry. A sleep would hide the window from every other language's adoption and turn a deterministic contract into a flake, and a retry in the client would hide a genuine backend defect that the conformance suite exists to surface. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
📝 WalkthroughWalkthrough
ChangesFlagd startup verification
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant StartFlagd
participant flagd_readyz
participant flagd_OFREP
StartFlagd->>flagd_readyz: Poll /readyz
flagd_readyz-->>StartFlagd: Return HTTP 200
StartFlagd->>flagd_OFREP: Evaluate selected enabled flag
flagd_OFREP-->>StartFlagd: Return served flag
StartFlagd-->>StartFlagd: Report startup success
Merge Risk: 🟡 Moderate · up to Startup can report success while flag evaluation is failing and can exceed its documented 10-second budget. These issues should be corrected before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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In `@launchpad/pkg/flagd.go`:
- Line 161: Update awaitReadyz and flagIsServed so each HTTP probe creates its
request with a context expiring at the shared deadline, then executes it through
client.Do instead of client.Get or client.Post. Preserve the existing request
methods, URLs, and response handling while ensuring no probe can outlive
deadline.
- Line 219: Update flagIsServed to accept an OFREP response only when its HTTP
status is http.StatusOK; retain the existing body check for successful responses
and return false for all other statuses so StartFlagd cannot report success on
HTTP errors.
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…ld not give Two gaps in the readiness probing added by the previous commit, both raised in review. The probes ran off a deadline the loops only consulted between requests, so a probe issued just short of it could still block for the client's 500ms timeout and push /start past the budget it advertises. Derive a context from the budget instead and issue every probe through client.Do with it, so the bound covers the requests themselves and a probe cannot outlive it. flagIsServed treated any response without FLAG_NOT_FOUND in the body as proof that the store was populated, including a 500. A 500 is not an evaluation at all - flagd is saying it could not answer - so it carries no information about the store, and accepting it could let /start report success while flagd was unable to evaluate the probe flag. Poll again on 5xx instead. Non-5xx answers still count: flagd returns 400 with PARSE_ERROR or GENERAL for a flag it holds but cannot resolve from the empty context the probe sends, and that answer only exists once the flag is in the store, so rejecting everything but 200 would turn such a configuration into a 10s timeout and a failed start. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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Two cross-references for whoever reviews this. Prior art. #222 found the Follow-up filed. The |
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Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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One claim in the description above is too strong, and new measurements against the unpatched I wrote that "a provider that blocks during its own initialisation absorbs the window and never sees it, which is why the flagd suites have always looked stable." It does not fully absorb it. The Go flagd RPC conformance suite, which does block during initialisation, produced 10 failures against a recorded baseline of 2 on that image. So the window is narrowed by a blocking provider rather than hidden by one, and "the flagd suites have always looked stable" should read as "less unstable than a stateless provider's", which is a weaker and more useful statement. Two further measurements, same image, on a different adoption than the one in the description:
Equally bad both ways, which is the point worth having: the flapping is this backend's and not any harness's. The Python suite independently measured the window itself at ~40ms. None of this changes the fix in this PR. It does change the severity: the observed range is much wider than the 22-and-29 in the description, and it is reproducible on demand rather than occasional. |
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Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
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Sep 13, 2026
Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
added a commit
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Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
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Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
added a commit
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Sep 13, 2026
Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
added a commit
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Sep 13, 2026
Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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added a commit
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Sep 13, 2026
This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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added a commit
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Sep 13, 2026
Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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Sep 13, 2026
This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
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Sep 14, 2026
Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
added a commit
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Sep 14, 2026
This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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Sep 14, 2026
… owns This suite's Compose file was the flagd adoption's with two ports removed, so it goes and the suite points at tests/flagd-testbed/docker-compose.yaml, which the flagd adoption introduced. Nothing about this suite's stack was ever its own except which port it asks the harness for, and that is stated in the test rather than in YAML. The rest is comments. The non-determinism this suite has always documented at length in its header -- the launchpad answering 404 to POST /reset, /start returning before flagd's file source has loaded the flags, a stateless provider racing that load every scenario -- is measured, explained and fixed in open-feature/flagd-testbed#394, so the header keeps the warning and the pointer and drops the mechanism. The missing testbed flags are flagd-testbed#392's the same way. The per-capability reasoning stays: why a provider with no EventHandler and no StateHandler withholds four capabilities, why @numeric-coercion is declared from the constraints of JSON rather than from flagd's ADR, and the @disabled-flags finding that was expected to be impossible and is not. tck_test.go 343 -> 241 lines, 291 comment lines to 189. No behaviour change: the only non-comment line that moved is the Compose path. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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Sep 14, 2026
test_ofrep.py was 368 lines to 35 of code, and the surplus was around the reasoning rather than in it: Appendix F's declaring rules quoted at length, the same spec revisions cited tag by tag, and two paragraphs comparing what the Java and Go OFREP adoptions did -- which is in PR #414's body, where a reviewer comparing four languages is actually looking. Both withholdings keep their measurements whole, because they are the two things here nothing else records: - @numeric-coercion, withheld because this provider never coerces -- json.loads keeps int and float apart and the check admits a value only on an exact isinstance, so the lossy row passes and a lossless one fails. Over OFREP the capability follows the language's JSON library. - @disabled-flags, withheld for a defect rather than an architecture, and the whole gap is one unconditional `data["variant"]` index on a member the protocol types optional. The wire response is kept, the measurement is kept, and the acknowledgement that this is the one declaration the corrected appendix says should change shape is kept in short form, pointing at PR #414 where the decision and the same measurement are recorded in full. The note also stops calling the defect unfiled: it is #418. Two claims went because they had gone stale rather than because they were duplication. The file argued at length with the appendix's rationale for gating @disabled-flags -- "a provider whose backend decides, such as one speaking OFREP, cannot" -- and the appendix no longer says it, so the rebuttal had nothing to rebut. settled_control.py keeps what it is and why it lives in this adoption rather than in the shared harness, and hands the mechanism of the window to open-feature/flagd-testbed#394, which explains it down to the buffered channel in flagd's file sync and measures it. Comments and docstrings only. The suite still reports 2 failed, 45 passed, 17 skipped, 1 xfailed. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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Sep 14, 2026
…ot have SettledControl wrapped the control API in a poll over the OFREP endpoint until a reseeded flag actually resolved, because flagd-testbed's POST /start returns before it serves the flag set -- open-feature/flagd-testbed#394 -- and a stateless provider has no initialisation to hide that window behind. Appendix F used to prescribe exactly this shape, and no longer does: a backend that returns before it serves has a defect to fix in the backend, and an adoption that compensates cannot be compared with one that does not against the same backend. Removing it changes nothing here, which is the point. Four consecutive runs give the same 2 failed / 45 passed / 17 skipped / 1 xfailed as before, and each takes 20s rather than 45s because it is no longer polling for a condition that was already true. The wrapper was 160 lines defending against a window this suite was not in fact losing to -- which is how a compensating wait usually ends up: hard to show is load-bearing, and easy to leave in long after its defect is fixed. The race is still real and still open upstream. A red run is read against the documented floor and repeated before the provider is blamed: the race moves between scenarios, a defect does not. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
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Sep 15, 2026
… owns This suite's Compose file was the flagd adoption's with two ports removed, so it goes and the suite points at tests/flagd-testbed/docker-compose.yaml, which the flagd adoption introduced. Nothing about this suite's stack was ever its own except which port it asks the harness for, and that is stated in the test rather than in YAML. The rest is comments. The non-determinism this suite has always documented at length in its header -- the launchpad answering 404 to POST /reset, /start returning before flagd's file source has loaded the flags, a stateless provider racing that load every scenario -- is measured, explained and fixed in open-feature/flagd-testbed#394, so the header keeps the warning and the pointer and drops the mechanism. The missing testbed flags are flagd-testbed#392's the same way. The per-capability reasoning stays: why a provider with no EventHandler and no StateHandler withholds four capabilities, why @numeric-coercion is declared from the constraints of JSON rather than from flagd's ADR, and the @disabled-flags finding that was expected to be impossible and is not. tck_test.go 343 -> 241 lines, 291 comment lines to 189. No behaviour change: the only non-comment line that moved is the Compose path. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
added a commit
to open-feature/java-sdk-contrib
that referenced
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Sep 15, 2026
Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
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Sep 15, 2026
Measured this pass: an RPC run came back with a fifth failure, FLAG_NOT_FOUND on an evaluation.feature row expecting no error code, and the next run of the same tree was clean. Same shape the OFREP adoption already records against open-feature/flagd-testbed#394, so it is named here rather than left for the next reader to diagnose as a regression. Comments only. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
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Sep 15, 2026
The four scenarios the new tag gates were mandatory and passing before it existed, so the "everything except @reinitialization" default already declares it. Recorded here anyway, because this file's standard is that each declaration rests on evidence from a run and not on inheriting the default. Measured in both resolver modes: 65 scenarios, 2 skipped, and the same four failures as before -- the lossy numeric coercion (open-feature/flagd#1996) and the three flags the pinned testbed image does not serve (open-feature/flagd-testbed#392). None of the four @string-typing scenarios is among them. flagd's flag definitions carry a JSON type per flag and both resolvers preserve it, so a non-string flag asked through the String accessor is a real mismatch here and is reported as one. RPC additionally showed the intermittent "half" variant failure this branch already records -- surefire's reruns had it pass four times in five, which is the testbed readiness window of open-feature/flagd-testbed#394 and not a property of any assertion. The clean-run tally is unchanged. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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added a commit
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that referenced
this pull request
Sep 15, 2026
This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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Sep 15, 2026
The "everything except" default already declares the new tag, so this records why that is right here rather than changing what is declared. handleResolved admits a value only on an exact type.isInstance check, so String.class.isInstance of a Boolean, an Integer or a Double is false and the provider answers TYPE_MISMATCH with the code default instead of the value's toString(). That is the same check the withheld @numeric-coercion reasoning cites, reached from the other side: strict typing loses the numeric tag and wins this one. Measured, not read: 65 scenarios with the skip count unchanged at 17, and none of the four @string-typing scenarios among the failures. The run carried three failures rather than the clean two -- a TYPE_MISMATCH answered as FLAG_NOT_FOUND, which passed on seven of surefire's eight reruns and is the testbed readiness flake of open-feature/flagd-testbed#394 this file already describes. The clean-run tally is unchanged. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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that referenced
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Sep 15, 2026
test_ofrep.py was 368 lines to 35 of code, and the surplus was around the reasoning rather than in it: Appendix F's declaring rules quoted at length, the same spec revisions cited tag by tag, and two paragraphs comparing what the Java and Go OFREP adoptions did -- which is in PR #414's body, where a reviewer comparing four languages is actually looking. Both withholdings keep their measurements whole, because they are the two things here nothing else records: - @numeric-coercion, withheld because this provider never coerces -- json.loads keeps int and float apart and the check admits a value only on an exact isinstance, so the lossy row passes and a lossless one fails. Over OFREP the capability follows the language's JSON library. - @disabled-flags, withheld for a defect rather than an architecture, and the whole gap is one unconditional `data["variant"]` index on a member the protocol types optional. The wire response is kept, the measurement is kept, and the acknowledgement that this is the one declaration the corrected appendix says should change shape is kept in short form, pointing at PR #414 where the decision and the same measurement are recorded in full. The note also stops calling the defect unfiled: it is #418. Two claims went because they had gone stale rather than because they were duplication. The file argued at length with the appendix's rationale for gating @disabled-flags -- "a provider whose backend decides, such as one speaking OFREP, cannot" -- and the appendix no longer says it, so the rebuttal had nothing to rebut. settled_control.py keeps what it is and why it lives in this adoption rather than in the shared harness, and hands the mechanism of the window to open-feature/flagd-testbed#394, which explains it down to the buffered channel in flagd's file sync and measures it. Comments and docstrings only. The suite still reports 2 failed, 45 passed, 17 skipped, 1 xfailed. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
added a commit
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Sep 15, 2026
…ot have SettledControl wrapped the control API in a poll over the OFREP endpoint until a reseeded flag actually resolved, because flagd-testbed's POST /start returns before it serves the flag set -- open-feature/flagd-testbed#394 -- and a stateless provider has no initialisation to hide that window behind. Appendix F used to prescribe exactly this shape, and no longer does: a backend that returns before it serves has a defect to fix in the backend, and an adoption that compensates cannot be compared with one that does not against the same backend. Removing it changes nothing here, which is the point. Four consecutive runs give the same 2 failed / 45 passed / 17 skipped / 1 xfailed as before, and each takes 20s rather than 45s because it is no longer polling for a condition that was already true. The wrapper was 160 lines defending against a window this suite was not in fact losing to -- which is how a compensating wait usually ends up: hard to show is load-bearing, and easy to leave in long after its defect is fixed. The race is still real and still open upstream. A red run is read against the documented floor and repeated before the provider is blamed: the race moves between scenarios, a defect does not. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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that referenced
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Sep 16, 2026
… owns This suite's Compose file was the flagd adoption's with two ports removed, so it goes and the suite points at tests/flagd-testbed/docker-compose.yaml, which the flagd adoption introduced. Nothing about this suite's stack was ever its own except which port it asks the harness for, and that is stated in the test rather than in YAML. The rest is comments. The non-determinism this suite has always documented at length in its header -- the launchpad answering 404 to POST /reset, /start returning before flagd's file source has loaded the flags, a stateless provider racing that load every scenario -- is measured, explained and fixed in open-feature/flagd-testbed#394, so the header keeps the warning and the pointer and drops the mechanism. The missing testbed flags are flagd-testbed#392's the same way. The per-capability reasoning stays: why a provider with no EventHandler and no StateHandler withholds four capabilities, why @numeric-coercion is declared from the constraints of JSON rather than from flagd's ADR, and the @disabled-flags finding that was expected to be impossible and is not. tck_test.go 343 -> 241 lines, 291 comment lines to 189. No behaviour change: the only non-comment line that moved is the Compose path. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
added a commit
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that referenced
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Sep 16, 2026
Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
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Sep 16, 2026
Measured this pass: an RPC run came back with a fifth failure, FLAG_NOT_FOUND on an evaluation.feature row expecting no error code, and the next run of the same tree was clean. Same shape the OFREP adoption already records against open-feature/flagd-testbed#394, so it is named here rather than left for the next reader to diagnose as a regression. Comments only. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
aepfli
added a commit
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that referenced
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Sep 16, 2026
The four scenarios the new tag gates were mandatory and passing before it existed, so the "everything except @reinitialization" default already declares it. Recorded here anyway, because this file's standard is that each declaration rests on evidence from a run and not on inheriting the default. Measured in both resolver modes: 65 scenarios, 2 skipped, and the same four failures as before -- the lossy numeric coercion (open-feature/flagd#1996) and the three flags the pinned testbed image does not serve (open-feature/flagd-testbed#392). None of the four @string-typing scenarios is among them. flagd's flag definitions carry a JSON type per flag and both resolvers preserve it, so a non-string flag asked through the String accessor is a real mismatch here and is reported as one. RPC additionally showed the intermittent "half" variant failure this branch already records -- surefire's reruns had it pass four times in five, which is the testbed readiness window of open-feature/flagd-testbed#394 and not a property of any assertion. The clean-run tally is unchanged. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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The "everything except" default already declares the new tag, so this records why that is right here rather than changing what is declared. handleResolved admits a value only on an exact type.isInstance check, so String.class.isInstance of a Boolean, an Integer or a Double is false and the provider answers TYPE_MISMATCH with the code default instead of the value's toString(). That is the same check the withheld @numeric-coercion reasoning cites, reached from the other side: strict typing loses the numeric tag and wins this one. Measured, not read: 65 scenarios with the skip count unchanged at 17, and none of the four @string-typing scenarios among the failures. The run carried three failures rather than the clean two -- a TYPE_MISMATCH answered as FLAG_NOT_FOUND, which passed on seven of surefire's eight reruns and is the testbed readiness flake of open-feature/flagd-testbed#394 this file already describes. The clean-run tally is unchanged. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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bda599f1 split @string-typing, holding float-flag and object-flag behind a new @fully-typed-values for backends that type a boolean and an integer but keep a float and a structure as text. OFREP is not one of them: the exact-instance check in handleResolved is indifferent to which type it is refusing, so one line of code answers all four questions, and both tags are declared. declarableExcept already picks the new tag up, so this is javadoc -- but the claim was measured, not inherited. After the re-pin: 65 scenarios, 45 passing, 3 failing, 17 skipped, with no FULLY_TYPED_VALUES entry among the skip reasons, and the newly standalone "A float flag is not returned as its string representation" executed and passing alongside the structured one. The skip composition is unchanged: LIFECYCLE 6, DISABLED_FLAGS 5, NUMERIC_COERCION 3, EVENTS 2, LARGE_INTEGERS 1. The clean-run tally in the class comment and the README stays at 46 passing and 2 failing. This run carried one extra failure, Example #1.1 resolving "on" as null, which is the shape and the magnitude the class comment already records for open-feature/flagd-testbed#394. The run before it was worse and is not reported as a regression either: the launchpad control API refused the first POST /start outright and all 65 scenarios errored, which cleared completely on rerun. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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test_ofrep.py was 368 lines to 35 of code, and the surplus was around the reasoning rather than in it: Appendix F's declaring rules quoted at length, the same spec revisions cited tag by tag, and two paragraphs comparing what the Java and Go OFREP adoptions did -- which is in PR #414's body, where a reviewer comparing four languages is actually looking. Both withholdings keep their measurements whole, because they are the two things here nothing else records: - @numeric-coercion, withheld because this provider never coerces -- json.loads keeps int and float apart and the check admits a value only on an exact isinstance, so the lossy row passes and a lossless one fails. Over OFREP the capability follows the language's JSON library. - @disabled-flags, withheld for a defect rather than an architecture, and the whole gap is one unconditional `data["variant"]` index on a member the protocol types optional. The wire response is kept, the measurement is kept, and the acknowledgement that this is the one declaration the corrected appendix says should change shape is kept in short form, pointing at PR #414 where the decision and the same measurement are recorded in full. The note also stops calling the defect unfiled: it is #418. Two claims went because they had gone stale rather than because they were duplication. The file argued at length with the appendix's rationale for gating @disabled-flags -- "a provider whose backend decides, such as one speaking OFREP, cannot" -- and the appendix no longer says it, so the rebuttal had nothing to rebut. settled_control.py keeps what it is and why it lives in this adoption rather than in the shared harness, and hands the mechanism of the window to open-feature/flagd-testbed#394, which explains it down to the buffered channel in flagd's file sync and measures it. Comments and docstrings only. The suite still reports 2 failed, 45 passed, 17 skipped, 1 xfailed. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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…ot have SettledControl wrapped the control API in a poll over the OFREP endpoint until a reseeded flag actually resolved, because flagd-testbed's POST /start returns before it serves the flag set -- open-feature/flagd-testbed#394 -- and a stateless provider has no initialisation to hide that window behind. Appendix F used to prescribe exactly this shape, and no longer does: a backend that returns before it serves has a defect to fix in the backend, and an adoption that compensates cannot be compared with one that does not against the same backend. Removing it changes nothing here, which is the point. Four consecutive runs give the same 2 failed / 45 passed / 17 skipped / 1 xfailed as before, and each takes 20s rather than 45s because it is no longer polling for a condition that was already true. The wrapper was 160 lines defending against a window this suite was not in fact losing to -- which is how a compensating wait usually ends up: hard to show is load-bearing, and easy to leave in long after its defect is fixed. The race is still real and still open upstream. A red run is read against the documented floor and repeated before the provider is blamed: the race moves between scenarios, a defect does not. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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test_ofrep.py was 368 lines to 35 of code, and the surplus was around the reasoning rather than in it: Appendix F's declaring rules quoted at length, the same spec revisions cited tag by tag, and two paragraphs comparing what the Java and Go OFREP adoptions did -- which is in PR #414's body, where a reviewer comparing four languages is actually looking. Both withholdings keep their measurements whole, because they are the two things here nothing else records: - @numeric-coercion, withheld because this provider never coerces -- json.loads keeps int and float apart and the check admits a value only on an exact isinstance, so the lossy row passes and a lossless one fails. Over OFREP the capability follows the language's JSON library. - @disabled-flags, withheld for a defect rather than an architecture, and the whole gap is one unconditional `data["variant"]` index on a member the protocol types optional. The wire response is kept, the measurement is kept, and the acknowledgement that this is the one declaration the corrected appendix says should change shape is kept in short form, pointing at PR #414 where the decision and the same measurement are recorded in full. The note also stops calling the defect unfiled: it is #418. Two claims went because they had gone stale rather than because they were duplication. The file argued at length with the appendix's rationale for gating @disabled-flags -- "a provider whose backend decides, such as one speaking OFREP, cannot" -- and the appendix no longer says it, so the rebuttal had nothing to rebut. settled_control.py keeps what it is and why it lives in this adoption rather than in the shared harness, and hands the mechanism of the window to open-feature/flagd-testbed#394, which explains it down to the buffered channel in flagd's file sync and measures it. Comments and docstrings only. The suite still reports 2 failed, 45 passed, 17 skipped, 1 xfailed. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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…ot have SettledControl wrapped the control API in a poll over the OFREP endpoint until a reseeded flag actually resolved, because flagd-testbed's POST /start returns before it serves the flag set -- open-feature/flagd-testbed#394 -- and a stateless provider has no initialisation to hide that window behind. Appendix F used to prescribe exactly this shape, and no longer does: a backend that returns before it serves has a defect to fix in the backend, and an adoption that compensates cannot be compared with one that does not against the same backend. Removing it changes nothing here, which is the point. Four consecutive runs give the same 2 failed / 45 passed / 17 skipped / 1 xfailed as before, and each takes 20s rather than 45s because it is no longer polling for a condition that was already true. The wrapper was 160 lines defending against a window this suite was not in fact losing to -- which is how a compensating wait usually ends up: hard to show is load-bearing, and easy to leave in long after its defect is fixed. The race is still real and still open upstream. A red run is read against the documented floor and repeated before the provider is blamed: the race moves between scenarios, a defect does not. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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test_ofrep.py was 368 lines to 35 of code, and the surplus was around the reasoning rather than in it: Appendix F's declaring rules quoted at length, the same spec revisions cited tag by tag, and two paragraphs comparing what the Java and Go OFREP adoptions did -- which is in PR #414's body, where a reviewer comparing four languages is actually looking. Both withholdings keep their measurements whole, because they are the two things here nothing else records: - @numeric-coercion, withheld because this provider never coerces -- json.loads keeps int and float apart and the check admits a value only on an exact isinstance, so the lossy row passes and a lossless one fails. Over OFREP the capability follows the language's JSON library. - @disabled-flags, withheld for a defect rather than an architecture, and the whole gap is one unconditional `data["variant"]` index on a member the protocol types optional. The wire response is kept, the measurement is kept, and the acknowledgement that this is the one declaration the corrected appendix says should change shape is kept in short form, pointing at PR #414 where the decision and the same measurement are recorded in full. The note also stops calling the defect unfiled: it is #418. Two claims went because they had gone stale rather than because they were duplication. The file argued at length with the appendix's rationale for gating @disabled-flags -- "a provider whose backend decides, such as one speaking OFREP, cannot" -- and the appendix no longer says it, so the rebuttal had nothing to rebut. settled_control.py keeps what it is and why it lives in this adoption rather than in the shared harness, and hands the mechanism of the window to open-feature/flagd-testbed#394, which explains it down to the buffered channel in flagd's file sync and measures it. Comments and docstrings only. The suite still reports 2 failed, 45 passed, 17 skipped, 1 xfailed. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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…ot have SettledControl wrapped the control API in a poll over the OFREP endpoint until a reseeded flag actually resolved, because flagd-testbed's POST /start returns before it serves the flag set -- open-feature/flagd-testbed#394 -- and a stateless provider has no initialisation to hide that window behind. Appendix F used to prescribe exactly this shape, and no longer does: a backend that returns before it serves has a defect to fix in the backend, and an adoption that compensates cannot be compared with one that does not against the same backend. Removing it changes nothing here, which is the point. Four consecutive runs give the same 2 failed / 45 passed / 17 skipped / 1 xfailed as before, and each takes 20s rather than 45s because it is no longer polling for a condition that was already true. The wrapper was 160 lines defending against a window this suite was not in fact losing to -- which is how a compensating wait usually ends up: hard to show is load-bearing, and easy to leave in long after its defect is fixed. The race is still real and still open upstream. A red run is read against the documented floor and repeated before the provider is blamed: the race moves between scenarios, a defect does not. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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Switches the @numeric-coercion deviation from withheld-and-skipped to declared-and-failing, which is the shape the TCK's settled guidance prefers, and records why paying its cost is the honest report. The guidance says withdrawing a capability in order to turn a failing scenario into a skip is the failure mode the field exists to prevent, and that is exactly what the old shape did here. Measured on the pinned testbed, in both modes: of the tag's three scenarios, "An integer requested as a float is widened without loss" passes. flagd therefore does coerce, and gets the narrowing direction wrong - a skip cannot distinguish that from "flagd declines to coerce", and only the second reading was available before. The argument for the old shape was real and is recorded rather than dropped: declaring the tag also fails "An integral float requested as an integer is coerced without loss", because integral-float-flag is absent from flagd-testbed v3.8.0. That cost is accepted because it is not a new kind of cost - this adoption already carries two failures from the same missing flags and records them plainly - and because the alternative hides a real defect behind a stack gap. Measured result, both modes: 56 scenarios, 2 skipped (@reinitialization, @large-integers), 4 failing - one provider defect and three testbed gaps. Also records something the previous pass reported as fixed and which does not hold on a loaded host: the first scenario of errors.feature still errors in in-process mode with an initialisation timeout against the doubled 30000 ms deadline. Reproduced three times, and reproduced identically with @numeric-coercion withheld, so it is not a consequence of this change. Thirty seconds is not a plausible sync time for this ruleset and only the mode that must establish a sync stream after the first POST /start is affected, so it reads as stack-side readiness - the class of defect open-feature/flagd-testbed#394 closes. The deadline stays at 15000 rather than being raised again: a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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Measured this pass: an RPC run came back with a fifth failure, FLAG_NOT_FOUND on an evaluation.feature row expecting no error code, and the next run of the same tree was clean. Same shape the OFREP adoption already records against open-feature/flagd-testbed#394, so it is named here rather than left for the next reader to diagnose as a regression. Comments only. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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The four scenarios the new tag gates were mandatory and passing before it existed, so the "everything except @reinitialization" default already declares it. Recorded here anyway, because this file's standard is that each declaration rests on evidence from a run and not on inheriting the default. Measured in both resolver modes: 65 scenarios, 2 skipped, and the same four failures as before -- the lossy numeric coercion (open-feature/flagd#1996) and the three flags the pinned testbed image does not serve (open-feature/flagd-testbed#392). None of the four @string-typing scenarios is among them. flagd's flag definitions carry a JSON type per flag and both resolvers preserve it, so a non-string flag asked through the String accessor is a real mismatch here and is reported as one. RPC additionally showed the intermittent "half" variant failure this branch already records -- surefire's reruns had it pass four times in five, which is the testbed readiness window of open-feature/flagd-testbed#394 and not a property of any assertion. The clean-run tally is unchanged. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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This suite declares everything declarable except nine capabilities, so it picked @standard-reasons up by default the moment the TCK gained it. Measured before it was written down. Eight of reason.feature's nine scenarios run and pass: STATIC for the four rule-less flags, ERROR beside FLAG_NOT_FOUND and TYPE_MISMATCH, and -- because @targeting is declared here -- TARGETING_MATCH and DEFAULT either side of targeting-key-flag's rule. The ninth carries @disabled-flags as well and is skipped for that omission, which is the right outcome rather than a second report of the same gap: what this provider does wrong with a value-less success is already stated once, in the withheld capability and its KnownDeviation, and a reason it never reaches is not more evidence of it. So the tag means "the standard vocabulary, over the responses this provider actually completes", and a reader sees the withheld @disabled-flags beside it and can tell which scenario went unasked. A clean run is 65 scenarios, 46 passing, 17 skipped and 2 failing, up from 56, 38 and 16. The two failures are the same testbed gaps as before. Also records something this pass measured rather than introduced: the suite is intermittently flaky. About half of the runs carry one or two extra failures where an evaluation comes back as the code default, or as FLAG_NOT_FOUND where TYPE_MISMATCH was expected, or with reason ERROR where a resolution was expected. The victim moves between errors.feature, evaluation.feature and reason.feature, so it is not a property of any assertion. Eight runs were measured, five at this revision and three at ccdb8879, and the old pin produced a seven-failure run and a two-failure run from the same tree -- so this predates the reason scenarios and is not caused by them. That is the flagd-testbed readiness window of open-feature/flagd-testbed#394 reaching a provider that holds nothing between calls, so every evaluation races the stack afresh. Recorded in the class javadoc and the README with an explicit instruction not to cover it with a settle after control calls, because a suite that sleeps instead of holding the control API to its promise stops being able to detect when the promise breaks. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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The "everything except" default already declares the new tag, so this records why that is right here rather than changing what is declared. handleResolved admits a value only on an exact type.isInstance check, so String.class.isInstance of a Boolean, an Integer or a Double is false and the provider answers TYPE_MISMATCH with the code default instead of the value's toString(). That is the same check the withheld @numeric-coercion reasoning cites, reached from the other side: strict typing loses the numeric tag and wins this one. Measured, not read: 65 scenarios with the skip count unchanged at 17, and none of the four @string-typing scenarios among the failures. The run carried three failures rather than the clean two -- a TYPE_MISMATCH answered as FLAG_NOT_FOUND, which passed on seven of surefire's eight reruns and is the testbed readiness flake of open-feature/flagd-testbed#394 this file already describes. The clean-run tally is unchanged. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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bda599f1 split @string-typing, holding float-flag and object-flag behind a new @fully-typed-values for backends that type a boolean and an integer but keep a float and a structure as text. OFREP is not one of them: the exact-instance check in handleResolved is indifferent to which type it is refusing, so one line of code answers all four questions, and both tags are declared. declarableExcept already picks the new tag up, so this is javadoc -- but the claim was measured, not inherited. After the re-pin: 65 scenarios, 45 passing, 3 failing, 17 skipped, with no FULLY_TYPED_VALUES entry among the skip reasons, and the newly standalone "A float flag is not returned as its string representation" executed and passing alongside the structured one. The skip composition is unchanged: LIFECYCLE 6, DISABLED_FLAGS 5, NUMERIC_COERCION 3, EVENTS 2, LARGE_INTEGERS 1. The clean-run tally in the class comment and the README stays at 46 passing and 2 failing. This run carried one extra failure, Example #1.1 resolving "on" as null, which is the shape and the magnitude the class comment already records for open-feature/flagd-testbed#394. The run before it was worse and is not reported as a regression either: the launchpad control API refused the first POST /start outright and all 65 scenarios errored, which cleared completely on rerun. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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… owns This suite's Compose file was the flagd adoption's with two ports removed, so it goes and the suite points at tests/flagd-testbed/docker-compose.yaml, which the flagd adoption introduced. Nothing about this suite's stack was ever its own except which port it asks the harness for, and that is stated in the test rather than in YAML. The rest is comments. The non-determinism this suite has always documented at length in its header -- the launchpad answering 404 to POST /reset, /start returning before flagd's file source has loaded the flags, a stateless provider racing that load every scenario -- is measured, explained and fixed in open-feature/flagd-testbed#394, so the header keeps the warning and the pointer and drops the mechanism. The missing testbed flags are flagd-testbed#392's the same way. The per-capability reasoning stays: why a provider with no EventHandler and no StateHandler withholds four capabilities, why @numeric-coercion is declared from the constraints of JSON rather than from flagd's ADR, and the @disabled-flags finding that was expected to be impossible and is not. tck_test.go 343 -> 241 lines, 291 comment lines to 189. No behaviour change: the only non-comment line that moved is the Compose path. Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>
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What
POST /startreturned as soon as flagd's/readyzreported 200, and treated that as "the seeded flag state is being served". It is not, and the gap is measurable: a stateless provider that evaluates the instant/startreturns getsFLAG_NOT_FOUNDfor flags the configuration plainly defines.This makes
/startblock until a real evaluation resolves, so a 200 means what the control API promises.Why
/readyzis not enoughflagd's file sync provider (
core/pkg/sync/file/filepath_sync.go:105) does:dataSyncismake(chan sync.DataSync, len(r.Syncs))— buffered to exactly the number of sources. So every source can hand its payload to the buffer and flip ready without a single one having been consumed. The parse and store swap that actually make the flags evaluable (updateAndEmit→Evaluator.SetState) run afterwards on the goroutine draining that channel./readyzis therefore doing what flagd's docs say it does — "all sync providers at least have one successful data sync" — but a successful data sync is not a populated store. Raised separately as open-feature/flagd#2047; this PR fixes our side regardless, since the testbed's control API is the thing making the hard promise.Measurements
Against
ghcr.io/open-feature/flagd-testbed:v3.10.1(flagd v0.16.0), 40 starts, evaluating over OFREP ~1.5ms after/startreturned:FLAG_NOT_FOUNDwindowIt is not OFREP-specific: the flagd RPC endpoint races identically (3/30 in the same experiment). A provider that blocks during its own initialisation absorbs the window and never sees it, which is why the flagd suites have always looked stable.
End to end, the Go OFREP conformance suite went from 22 and 29 failures over two consecutive runs with near-disjoint failing sets to the same 2 failures twice — and those 2 are the known fixture gap (
large-integer-flag,integral-float-flag) that #392 fills, not a race.That the two runs' failing sets were near-disjoint is itself explained by a second gap. The control API marks
POST /resetoptional and this testbed does not implement it, so a conformance client that prefers/resetfor scenario isolation gets a 404 and falls back to/start?config=default— before every scenario, not just the first. A race paid once per suite cannot produce disjoint failing sets. A race re-rolled before every scenario can: at 35% per/start, the expected number of racy scenarios is 0.35 × N, sampled independently on each run. The measurement above and the symptom here are the same defect seen from two ends.How
After
/readyzis 200, poll a real evaluation over OFREP until it resolves, within the existing 10s budget.Probe keys are derived from the flagd configuration being started — one enabled flag per
filesource — rather than hardcoded:metadata.jsondoes not useflags/allFlags.jsonat all), so a fixed key would not survive them;FLAG_NOT_FOUNDfor those too, which would be indistinguishable from an empty store.If no probe key can be derived, it logs and falls back to the readiness probe alone, so an unfamiliar configuration cannot turn into a failing start.
Deliberately not a
sleepand not a blanket retry: a sleep would hide the window from every other language's adoption and turn a deterministic contract into a flake, and a retry in the client would hide a genuine backend defect that the conformance suite exists to surface.Cost
/startgoes from ~120-145ms to ~140-190ms — it now waits out exactly the window it used to return inside of. All four configurations (default,metadata,ssl,sync-payload) start green with no fallback logged.That ~45ms is paid per scenario, not once per suite, for the
/resetreason above. The testbed's own gherkin expands to ~325 executed scenarios (34 plain, plus 291 example rows across 56 outlines); no single adoption runs every feature, but the order of magnitude is hundreds, so the added wall-clock is seconds to tens of seconds over a full suite. That is the right trade — it buys determinism that is currently absent — but it is worth stating as a recurring cost rather than a one-off.A
POST /resetthat restores the baseline without restarting flagd would avoid paying a full start per scenario at all. It would need this same "do not return until it is actually being served" guarantee, so it is a natural follow-up to this PR rather than an alternative to it.Testing
go build ./...,go vet ./...,go test -count=1 ./...— cleannpm run gherkin-lint— clean (no Gherkin touched)Notes
main; does not touch feat: flags and scenarios for numeric precision #392 or feat: scenarios for type mismatch across the value types #393./readyzreports ready before flags are evaluable flagd#2047.