proxy: v2.211.0

[olix0r]

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.

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• build(deps): bump DavidAnson/markdownlint-cli2-action (build(deps): bump DavidAnson/markdownlint-cli2-action from 9.0.0 to 12.0.0 linkerd2-proxy#2460)
• build(deps): bump tj-actions/changed-files from 36.2.1 to 39.0.2 (build(deps): bump tj-actions/changed-files from 36.2.1 to 39.0.2 linkerd2-proxy#2468)
• build(deps): bump EmbarkStudios/cargo-deny-action from 1.5.0 to 1.5.4 (build(deps): bump EmbarkStudios/cargo-deny-action from 1.5.0 to 1.5.4 linkerd2-proxy#2448)
• meshtls: log errors parsing client certs (meshtls: log errors parsing client certs linkerd2-proxy#2467)
• build(deps): bump actions/checkout from 3.5.0 to 4.1.0 (build(deps): bump actions/checkout from 3.5.0 to 4.1.0 linkerd2-proxy#2474)
• build(deps): bump tj-actions/changed-files from 39.0.2 to 39.2.0 (build(deps): bump tj-actions/changed-files from 39.0.2 to 39.2.0 linkerd2-proxy#2475)
• build(deps): bump EmbarkStudios/cargo-deny-action from 1.5.4 to 1.5.5 (build(deps): bump EmbarkStudios/cargo-deny-action from 1.5.4 to 1.5.5 linkerd2-proxy#2478)
• build(deps): bump DavidAnson/markdownlint-cli2-action (build(deps): bump DavidAnson/markdownlint-cli2-action from 12.0.0 to 13.0.0 linkerd2-proxy#2476)
• build(deps): bump actions/upload-artifact from 3.1.2 to 3.1.3 (build(deps): bump actions/upload-artifact from 3.1.2 to 3.1.3 linkerd2-proxy#2479)
• Render grpc_status metric label as number (Render grpc_status metric label as number linkerd2-proxy#2480)
• balance: Log and fail stuck discovery streams. (balance: Log and fail stuck discovery streams. linkerd2-proxy#2484)
• build(deps): update rustix to v0.36.16/v0.37.7 (build(deps): update rustix to v0.36.16/v0.37.7 linkerd2-proxy#2488)
• balance: Fail the discovery stream on queue backup (balance: Fail the discovery stream on queue backup linkerd2-proxy#2486)