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* feat(metrics): expose 3 Prometheus counters for the scaling dive Per the spec section 6 of #7756: enables the load-test harness to attribute *where* time goes on the server, not just the gauge headline (CPU / event-loop / memory) the dive doc starts from. New /stats/prometheus rows: - etherpad_pad_users{padId} — gauge, derived from sessioninfos on each scrape. Lets the harness confirm the pad it points at actually has the expected concurrency. - etherpad_changeset_apply_duration_seconds — histogram observed inside handleUserChanges. Separates "apply path is slow" from "fan-out is slow" when latency rises. - etherpad_socket_emits_total{type} — counter at the broadcast emit sites (handleCustomObjectMessage, handleCustomMessage, sendChatMessageToPadClients) and inside the NEW_CHANGES per-socket loop in updatePadClients. Bucketed by message type so the harness can measure the amplification factor of each lever (especially the fan-out batching lever). Metric handles live in a new prom-instruments.ts module rather than in prometheus.ts itself, so PadMessageHandler can import the recording helpers without creating a circular dependency (prometheus.ts already requires PadMessageHandler). Tests: smoke test verifies recordSocketEmit + recordChangesetApply move the underlying counters/histogram. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(metrics): address Qodo review — flag-gate, scope histogram, bound label cardinality Three issues raised on the initial PR: 1. **Feature flag.** Per project compliance rule, new features must be behind a flag and disabled by default. Adds `settings.scalingDiveMetrics` (default `false`). When off, recordSocketEmit() / recordChangesetApply() short-circuit to no-ops and the metrics are never even registered with the Prometheus register. Enable only when running the ether/etherpad-load-test scaling-dive harness. 2. **Histogram scope.** Previously the etherpad_changeset_apply_duration_seconds timer wrapped the whole handleUserChanges() body — including `await exports.updatePadClients(pad)` — so the histogram measured apply+fan-out, defeating its stated purpose. Now stopped immediately after the apply work (`assert.equal(...rev, r)`), before the ACCEPT_COMMIT socket emit and the updatePadClients call. Failed applies deliberately don't observe so the success-path distribution stays clean. 3. **Label cardinality.** handleCustomMessage was passing the user-supplied msgString (an HTTP-API param) directly as the `type` label value. A misbehaving API caller could grow prom-client's internal label map until OOM. Now bucketed against a known-types allowlist; anything outside it lands in `other`. Tests updated: 5/5 — covers happy path, "other" bucketing of unknown/unsafe labels, and that the flag-disabled state is a true no-op. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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| .. | ||
| APIHandler.ts | ||
| APIKeyHandler.ts | ||
| ExportHandler.ts | ||
| ImportHandler.ts | ||
| PadMessageHandler.ts | ||
| RestAPI.ts | ||
| SocketIORouter.ts | ||