refactor(app): Outline route label extractor #3337
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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, and (b) the number of bytes included in body frames. 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 Signed-off-by: katelyn martin <[email protected]>
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this commit promotes the `RetryLabelExtract` type out of the route retry middleware, and into the metrics submodule. in preparation for generalizing this component, we rename it to `RouteLabelExtract`. Signed-off-by: katelyn martin <[email protected]>
this addresses the `TODO` comment, moving the `RouteLabelExtract` type out of the policy route layer function. this defines a method on `MatchedRoute` which may be called to retrieve a `RouteLabelExtract`. that type holds references to the contruction-time information about the route, and can be used to later inspect an outbound request at call-time, returning a `labels::Route` set of labels. this is a helpful piece of reusable glue that is broadly useful in instrumenting our route-level middleware. Signed-off-by: katelyn martin <[email protected]>
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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, and (b) the number of bytes included in body frames. 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 Signed-off-by: katelyn martin <[email protected]>
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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, and (b) the number of bytes included in body frames. 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. Signed-off-by: katelyn martin <[email protected]>
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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, and (b) the number of bytes included in body frames. 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. Signed-off-by: katelyn martin <[email protected]>
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this PR, based upon #3308, generalizes the
ExtractParam<P, T>type used to retrieve Prometheus labels for the route-level retry middleware. this is a helpful component we'll want in order to build route-level frame counting middleware.refactor(app): Hoist label extractor out of retry middleware
this commit promotes the
RetryLabelExtracttype out of the route retry middleware, and into the metricssubmodule.
in preparation for generalizing this component, we rename it to
RouteLabelExtract.refactor(app): Outline route label extraction
this addresses the
TODOcomment, moving theRouteLabelExtracttype out of the policy route layerfunction.
this defines a method on
MatchedRoutewhich may be called to retrieve aRouteLabelExtract. that typeholds references to the contruction-time information about the route, and can be used to later inspect an
outbound request at call-time, returning a
labels::Routeset of labels.this is a helpful piece of reusable glue that is broadly useful in instrumenting our route-level
middleware.
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