Linkerd - stable-2.12.2

stable-2.12.2

This stable release fixes an issue with CNI chaining that was preventing the
Linkerd CNI plugin from working with other CNI plugins such as Cilium. It also
fixes some sections of the Viz dashboard appearing blank, and adds an optional
PodMonitor resource to the Helm chart to enable easier integration with the
Prometheus Operator. Several other fixes are included.

• Proxy

• Fixed proxies emitting some duplicate inbound metrics

• Control Plane

• Fixed handling of .conf files in the CNI plugin so that the Linkerd CNI
  plugin can be used alongside other CNI plugins such as Cilium
• Added a noop init container to injected pods when the CNI plugin is enabled
  to prevent certain scenarios where a pod can get stuck without an IP address
• Fixed the NotIn label selector operator in the policy resources being
  erroneously treated as In.

• Fixed a bug where theconfig.linkerd.io/proxy-version annotation could be
  empty

• CLI

• Added a linkerd diagnostics policy command to inspect Linkerd policy state
• Added a check that ClusterIP services are in the cluster networks
• Expanded the linkerd authz command to display AuthorizationPolicy
  resources that target namespaces (thanks @aatarasoff!)
• Fixed warning logic in the "linkerd-viz ClusterRoles exist" and "linkerd-viz
  ClusterRoleBindings exist" checks in linkerd viz check

• Fixed the CLI ignoring the --api-addr flag (thanks @mikutas!)

• Helm

• Added an optional PodMonitor resource to the main Helm chart (thanks
  @jaygridley!)

• Dashboard

• Fixed the dashboard sections Tap, Top, and Routes appearing blank (thanks
  @MoSattler!)
• Updated Grafana dashboards to use variable duration parameter so that they
  can be used when Prometheus has a longer scrape interval (thanks @TarekAS)