This PR adds the `request_duration_ms` metric to the Prometheus metrics exported by the proxy. It also modifies the `request_total` metric so that it is incremented when a request stream finishes, rather than when it opens, for consistency with how the `response_total` metric is generated.
Making this change required modifying `telemetry::sensors::http` to generate a `StreamRequestEnd` event similar to the `StreamResponseEnd` event. This is done similarly to how sensors are added to response bodies, by generalizing the `ResponseBody` type into a `MeasuredBody` type that can wrap a request or response body. Since this changed the type of request bodies, it necessitated changing request types pretty much everywhere else in the proxy codebase in order to fix the resulting type errors, which is why the diff for this PR is so large.
Closes#570
We’ve built Conduit from the ground up to be the fastest, lightest,
simplest, and most secure service mesh in the world. It features an
incredibly fast and safe data plane written in Rust, a simple yet
powerful control plane written in Go, and a design that’s focused on
performance, security, and usability. Most importantly, Conduit
incorporates the many lessons we’ve learned from over 18 months of
production service mesh experience with Linkerd.
This repository contains a few tightly-related components:
- `proxy` -- an HTTP/2 proxy written in Rust;
- `controller` -- a control plane written in Go with gRPC;
- `web` -- a UI written in React, served by Go.
Oliver Gould
Eliza Weisman