proxy: v2.211.0 (#11511)

328826caa updated the balancer's discovery channel to prevent backing up
into the discovery stream by dropping the discovery stream. This results
in balancers becoming permanently stale (should they ever be used
again).

This change modifies the discovery stream so that these errors are fatal
for the balancer. These errors are recorded distinctly by the error counters.

To fix this, we replace the `DiscoverNew` module with a
`discover::NewServices` module that wraps the buffering layer. The
buffer now only holds target metadata, and services are only built as
the entry is dequeued from channel.

This has the (positive) side-effect that the proxy's stack_create_total
metric will not be incremented before the balancer actually uses an
endpoint stack. Previously, this metric would be incremented for all
queued endpoint updates.

We also now log at INFO the address of all additions and removals from a
balancer. This should dramatically improve diagnostics in stale endpoint
situations.

---

* build(deps): bump DavidAnson/markdownlint-cli2-action (linkerd/linkerd2-proxy#2460)
* build(deps): bump tj-actions/changed-files from 36.2.1 to 39.0.2 (linkerd/linkerd2-proxy#2468)
* build(deps): bump EmbarkStudios/cargo-deny-action from 1.5.0 to 1.5.4 (linkerd/linkerd2-proxy#2448)
* meshtls: log errors parsing client certs (linkerd/linkerd2-proxy#2467)
* build(deps): bump actions/checkout from 3.5.0 to 4.1.0 (linkerd/linkerd2-proxy#2474)
* build(deps): bump tj-actions/changed-files from 39.0.2 to 39.2.0 (linkerd/linkerd2-proxy#2475)
* build(deps): bump EmbarkStudios/cargo-deny-action from 1.5.4 to 1.5.5 (linkerd/linkerd2-proxy#2478)
* build(deps): bump DavidAnson/markdownlint-cli2-action (linkerd/linkerd2-proxy#2476)
* build(deps): bump actions/upload-artifact from 3.1.2 to 3.1.3 (linkerd/linkerd2-proxy#2479)
* Render grpc_status metric label as number (linkerd/linkerd2-proxy#2480)
* balance: Log and fail stuck discovery streams. (linkerd/linkerd2-proxy#2484)
* build(deps): update `rustix` to v0.36.16/v0.37.7 (linkerd/linkerd2-proxy#2488)
* balance: Fail the discovery stream on queue backup (linkerd/linkerd2-proxy#2486)

Signed-off-by: Oliver Gould <ver@buoyant.io>

.proxy-version

@@ -1 +1 @@
-v2.210.0
+v2.211.0