/healthz accounted for ~47% of prod's daily access log and the internal
frontend_ssr->backend content-API hop for another ~32%, each costing a
threadpool dispatch + lock + file write on the request path for traffic
that isn't meaningful to retain. classify_inbound gains "health" and
"internal" categories for these, both excluded from audit.log_access
(alongside the existing static/metrics/event exclusions) so they're never
dispatched to the logging threadpool at all.
The access log's client IP is now truncated to /24 (IPv4) or /48 (IPv6)
before being persisted -- coarse geo/abuse signal without keeping a full,
joinable address in Loki for the 30-day retention window, matching the
privacy page's claim that IPs aren't logged beyond normal request
handling. The rate limiter keyed off the same IP (_rate_ok) is untouched
and still sees full precision.
uvicorn's own --no-access-log now suppresses its duplicate per-request
line, since the app's own middleware already writes one.
