linkerd/linkerd2 edge-21.1.3

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edge-21.1.3

This edge release improves proxy diagnostics and recovery in situations where
the proxy is temporarily unable to route requests. Additionally, the viz and
multicluster CLI sub-commands have been updated for consistency.

Full release notes:

• Added Helm-style set, set-string, values, set-files customization
  flags for the linkerd install and linkerd multicluster install commands
• Fixed an issue where linkerd metrics could return metrics for the incorrect
  set of pods when there are overlapping label selectors
• Added tap-injector to linkerd-viz which is responsible for adding the tap
  service name environment variable to the Linkerd proxy container
• Improved diagnostics when the proxy is temporarily unable to route requests
• Made proxy recovery for a service more robust when the proxy is unable to
  route requests, even when new requests are being received
• Added client and server prefixes in the proxy logs for socket-level errors
  to indicate which side of the proxy encountered the error
• Improved jaeger-injector reliability in environments with many resources by
  adding watch RBAC permissions
• Added check to confirm whether the jaeger-injector pod is in running state
  (thanks @yashvardhan-kukreja!)
• Fixed a crash in the destination controller when EndpointSlices are enabled
  (thanks @oleh-ozimok!)
• Added a linkerd viz check sub-command to verify the states of the
  linkerd-viz components
• Added a log-format flag to optionally output the control plane component log
  output as JSON (thanks @mo4islona!)
• Updated the logic in the metrics and profile subcommands to use the
  namespace specified by the current-context of the KUBECONFIG so that it is
  no longer necessary to use the --namespace flag to query resources in the
  current namespace. Queries for resources in namespaces other than the
  current namespace still require the --namespace flag
• Added new pod 'linkerd-metrics-api' set up by linkerd viz install that
  manages all functionality dependent on Prometheus, thus removing most of the
  dependencies on Prometheus from the linkerd core installation
• Removed need to have linkerd-viz installed for the
  linkerd multicluster check command to properly work.