refactor(metrics): drop active_sessions_total gauge#12
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The active_sessions_gauge background task ran a `SELECT COUNT(*)` against Postgres every 60s purely to refresh a capacity-planning gauge. That poll generated continuous TAP traffic on the auth VM (and on Postgres), pinning both awake and defeating scale-to-zero for an idle app. The gauge is non-essential — session counts are derivable from existing auth event counters when needed — so remove the task, its spawn/abort wiring, the metric definition, and the now-orphaned sqlx offline cache. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Removes the
active_sessions_gaugebackground task and itsauth_active_sessions_totalmetric.Why
The task ran
SELECT COUNT(*) FROM auth.sessions ...against Postgres every 60s solely to refresh a capacity-planning gauge. That poll generated continuous TAP traffic on the auth VM and on Postgres, pinning both VMs awake and defeating scale-to-zero for an otherwise idle app. Of the 5 primitive VMs per app, auth + queue + postgres never deep-sleep largely because of polls like this one.The gauge is non-essential (session counts can be derived from existing auth event counters or an ad-hoc query when needed), so this is a clean removal.
Changes
active_sessions_gauge(src/http.rs)src/cli.rs)active_sessions_totalmetric definition (src/metrics.rs)Builds clean (
SQLX_OFFLINE=true cargo check); no remaining references anywhere in the repo.🤖 Generated with Claude Code