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APM Dashboards

API latency, error rate, and throughput per route.

Last updated 05/24/26

What this surface does

APM Dashboards chart API route latency (p50/p95/p99), error rate, and request volume sourced from `api_latency_samples` (migration 173). Each chart is per-route with time-range and percentile selectors.

When to use it

  • Investigating a "site feels slow" report — find the route with the regression.
  • Capacity planning — which routes are trending up in volume.
  • Pre/post deploy comparison — did the new release introduce p95 regression on any hot path.

Key gotchas

  • Samples are written by the API middleware. Routes that bypass middleware (static assets, edge functions) are not in the data.
  • The default percentile is p95. p99 includes tail outliers (cold starts, slow DB queries) and is the right percentile for SLO alerts.
  • Data retention is 30 days. Older data is archived — use the Backfill Launcher to replay if needed.

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