7e242ca07a
PR #654 adds pod-based metric labels to the Destination API responses for cluster-local services. This PR modifies the proxy to actually add these labels to reported Prometheus metrics for outbound requests to local services. It enhances the proxy's `control::discovery` module to track these labels and add a `LabelRequest` middleware to the service stack built in `Bind` for labeled services. Requests transiting `LabelRequest` are given an `Extension` which contains these labels, which are then added to events produced by the `Sensors` for these requests. When these events are aggregated to Prometheus metrics, the labels are added. I've also added some tests in `test/telemetry.rs` ensuring that these metrics are added correctly when the Destination service provides labels. Closes #660 Signed-off-by: Eliza Weisman <eliza@buoyant.io> |
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