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## edge-23.12.2

This edge release includes a restructuring of the proxy's balancer along with
accompanying new metrics. The new minimum supported Kubernetes version is 1.22.

* Restructured the proxy's balancer ([#11750]): balancer changes may now occur
  independently of request processing. Fail-fast circuit breaking is enforced on
  the balancer's queue so that requests can't get stuck in a queue indefinitely.
  This new balancer is instrumented with new metrics: request (in-queue) latency
  histograms, failfast states, discovery updates counts, and balancer endpoint
  pool sizes.
* Changed how the policy controller updates HTTPRoute status so that it doesn't
  affect statuses from other non-linkerd controllers ([#11705]; fixes [#11659])

[#11750]: https://github.com/linkerd/linkerd2/pull/11750
[#11705]: https://github.com/linkerd/linkerd2/pull/11705
[#11659]: https://github.com/linkerd/linkerd2/pull/11659
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