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55276d1e84
Two runbook readings were misleading in ways that hid a real devnet issue.
The Online-Delete Rotation Window row said a healthy node shows the flag
"briefly 1 once per delete interval". That is true but not sufficient:
rotation_state{metric="in_flight"} is set immediately before
freshenCaches() and cleared by RotationExposureGuard on scope exit, so it
brackets only the freshen/swap phase. Measured on devnet-otel-usw2-01/02
with online_delete=256 and ~47.4M state nodes, the flag averaged
0.159/0.135 over 9 h while the node was inside a rotation ~93% of wall
clock, because the dominant visitNodes copy phase (median 651 s of an
~785 s cycle) emits nothing. The row read healthy on a rotation-bound
node. Add a scope note with the log triplet that does measure occupancy.
The Consensus Round Duration panel gained a p99 series, so retitle both
references and say when to read it: at ~19 rounds/min a single stalled
round is one sample in several hundred, so p95 stays at the normal close
time and can dip. An 11.4 s round measured p99 13400 ms while p95 read
3400 ms against a 2900-3787 ms baseline.
Instrumenting the copy phase is tracked in RIPD-7144; the underlying
rotation defects in RIPD-7720.