docs(hardware): the shelf switch is in U4 on UPS power (#110) - #406
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The TP-Link that prometheus and oracle hang off had no battery, so on a mains cut the two laptops kept running and went deaf — the monitoring host surviving the event it exists to observe and unable to report it. Racked on the 1U vented shelf in U4 on 2026-09-08, uplink back on port 3 of neo, and its power moved onto a UPS-fed outlet, which is the step that closes the gap. Read from the monitoring host during the move: oracle's link down at 18:33:04 UTC, back at 19:01:07, all 22 scrape targets up within a minute of that and oracle pushing again; a 45-minute silence on warning and critical held for the duration and was expired by hand afterwards. That the outlet is UPS-fed is attested by the person at the rack — the UPS cannot say which device draws from it. hardware.md gains the U4 row, network.md's TP-Link note and the UPS runbook's status banner say it is done, the roadmap entry moves to Done, and the README's top-items sentence drops the shelf. Closes #110. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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The shelf switch is racked in U4 and on UPS power, done 2026-09-08. Docs follow the hardware.
Verified from the monitoring host during the move: oracle's link out at 18:33:04 UTC, back at 19:01:07;
neoport 3 up with the TP-Link's uplink on it; all 22 scrape targets up within a minute of the link returning, oracle pushing again. A 45-minute silence on warning and critical covered the move and was expired afterwards. That the outlet is UPS-fed is attested by the person at the rack; the UPS cannot say which device draws from it.Changed:
hardware.md(U4 row, off-rack sentence, accessories),network.md(the TP-Link note),fit-the-ups-battery.md(status banner),docs/roadmap.md(#110 to Done, with the two accidental closes recorded),README.md(top-items sentence).Checks:
make check-docs,scripts/lint.sh.Closes #110 — deliberately this time.
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