Three data-hygiene fixes for the MCP metric tools, all driven by
incomplete/abandoned sessions distorting aggregates:
- get_usage_metrics: clamp each session duration to the shared 7-day
ceiling before avg/median/p95/p99, so stuck non-terminal sessions
(unclamped now-StartedAt wall-clock) no longer push p99 into weeks.
Surface SampleCount + ClampedSessionCount so the skew stays visible.
- get_metrics: tally Pending/Stalled into their own buckets and route
any other status into `other`, so the per-tenant buckets reconcile to
total by construction (closes the silent 214/134 gap). Extracted the
fold into SessionStatusBuckets.
- slowestApps: require >=3 successful installs via the shared
MetricsMath.SelectSlowestApps helper, so a single N=1 (often
unfinished, legacy pre-clamp) install cannot dominate the ranking;
also de-dupes the copy-pasted block across the tenant + global
app-metrics functions.
Adds xUnit regression cover for all three.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Oliver Kieselbach