refactor(app/inbound): consolidate route label encoding#4198
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in #4180, we noted during review that encoding prometheus labels for route and parent metadata entails a slightly unfortunate amount of repetitive boilerplate. in the outbound proxy, we define a local `RouteLabels` type that implements the `EncodeLabelSet` and `EncodeLabelSetMut`, which we use to integrate label sets with the `prometheus_client` SDK. this commit introduces an equivalent pattern to the inbound proxy. a `RouteLabels` newtype wrapper over the shared `linkerd_app_core` structure is introduced, which in turn simplifies the `EncodeLabelSet` and `EncodeLabelSetMut` implementations of the `RequestCountLabels`, `ResponseBodyDataLabels`, and `RequestBodyDataLabels` types. Signed-off-by: katelyn martin <kate@buoyant.io>
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in #4180, we noted during review that encoding
prometheus labels for route and parent metadata entails a slightly
unfortunate amount of repetitive boilerplate.
in the outbound proxy, we define a local
RouteLabelstype thatimplements the
EncodeLabelSetandEncodeLabelSetMut, which we use tointegrate label sets with the
prometheus_clientSDK.this commit introduces an equivalent pattern to the inbound proxy. a
RouteLabelsnewtype wrapper over the sharedlinkerd_app_corestructure is introduced, which in turn simplifies the
EncodeLabelSetand
EncodeLabelSetMutimplementations of theRequestCountLabels,ResponseBodyDataLabels, andRequestBodyDataLabelstypes.Signed-off-by: katelyn martin kate@buoyant.io