feat(app): Route frame count metrics #3334
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This was referenced Nov 10, 2024
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### ⛅ overview this introduces a new tower middleware for Prometheus metrics, used for instrumenting HTTP and gRPC request bodies, and observing (a) the number of frames yielded by a body, (b) the number of bytes included in body frames, and (c) a distribution of the size of frames yielded. this builds upon the backend-level metrics added in #3308. this additionally uses the route label extractor, hoisted out of the retry middleware's Prometheus telemetry in #3337. ### 📝 changes * a `linkerd_http_prom::body_data::request::NewRecordBodyData::NewRecordBodyData` middleware is added, which complements the equivalent `linkerd_http_prom::body_data::response` middleware. * this is added to policy routes' metrics layer. see prometheus/client_rust#241 and prometheus/client_rust#242, which track upstream proposals to add accessors to `Histogram` that will allow us to make test assertions that metrics are working properly. for now, these are feature gated as also done in #3308. Signed-off-by: katelyn martin <[email protected]>
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feat(app): Route frame count metrics
⛅ overview
this introduces a new tower middleware for Prometheus metrics, used for
instrumenting HTTP and gRPC request bodies, and observing (a) the
number of frames yielded by a body, (b) the number of bytes included
in body frames, and (c) a distribution of the size of frames yielded.
this builds upon the backend-level metrics added in #3308. this
additionally uses the route label extractor, hoisted out of the retry
middleware's Prometheus telemetry in #3337.
📝 changes
a
linkerd_http_prom::body_data::request::NewRecordBodyData::NewRecordBodyDatamiddleware is added, which complements the equivalent
linkerd_http_prom::body_data::responsemiddleware.this is added to policy routes' metrics layer.
see prometheus/client_rust#241 and prometheus/client_rust#242, which
track upstream proposals to add accessors to
Histogramthat will allowus to make test assertions that metrics are working properly. for now,
these are feature gated as also done in #3308.
🔗 related