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8633df7a3e
Two suspects from the 3.3.0 slowdown investigation had no signal. Both were already computing the numbers and throwing them away, so this exposes them rather than adding measurement. Per-sweep heap trim. The trim runs after every cache sweep, and its cost scales with resident heap, so it is the leading explanation for a node with a populated database syncing slower than a fresh one. The report already carried duration, fault deltas and reclaimed pages, but the whole measurement sat behind a debug-journal check, so an ordinary node measured nothing, and the call site discarded the result. The measurement now always runs and only the log line stays gated. Records trim duration, minor faults and reclaimed kilobytes. Measured cost of the always-on path is about six microseconds per sweep against a trim costing milliseconds, at a cadence of ten to a hundred and twenty seconds. Honest limit, stated in the runbook: the fault delta spans only the trim call, so it shows the trim itself faulting but not the faults that follow as caches refill. The duration is the signal to correlate against sweep-job queueing. Rotation writes. Rotation copies archive-served reads forward and re-stores nodes missing from both backends, both of which compete with sync I/O and only happen on a populated online_delete database. The copy-forward count existed but was reset by the rotation's own log line, so a metric reading it would drop to zero on every swap; a never-reset total sits beside it now. The re-store count was not measured at all. Rotation duration is deliberately not recorded: the health throttle sleeps at eight points inside the sequence and dominates exactly when the node is unhealthy, so the number would conflate work with waiting. Nothing added for the other two suspects. Get-object serving is already covered by the handler label, the lookup histogram and the deferred and saturation gauges; peer churn by the disconnect-reason counter. Also replaces nine per-file cspell ignores with one ignoreRegExpList entry for the telemetry macro names, and picks up the levelization baseline for the consensus span-name test. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>