Follow-up to #355: http_request_duration_seconds's `route` label captured raw
content-hashed asset filenames (route="/assets/index-CAbxDtto.js",
"/assets/chunk-*.js"). @fastify/static serves each file through a route whose
matched routeOptions.url IS the raw hashed path, so the label was unbounded — a
new set of names every deploy, growing the series forever (the exact cardinality
leak the API routes were protected against).
resolveRouteLabel now detects a static request by its path prefix (/assets/,
/vad/, /brand/, /locales/) FIRST and collapses it to a single `static` label
(query string stripped before the check); API routes still use the template and
404s still collapse to `unknown`. Static edge latency is already measured by
Traefik's traefik_router_request_duration_*.
Gate: server tsc 0; metrics.spec passes (added static-collapse + query-strip +
"real API route mentioning assets is NOT collapsed" cases).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
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