linkerd/linkerd2 edge-21.7.3

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edge-21.7.3

This edge release introduces several changes around metrics. ReplicaSets are now
a supported resource and metrics can be associated with them. A new metric has
been added which counts proxy errors encountered before a protocol can be
detected. Finally, the request errors metric has been split into separate
inbound and outbound directions.

• Fixed printing check --pre command usage if it fails after being unable to
  connect to Kubernetes (thanks @rdileep13!)
• Updated the default skip and opaque ports to match that which is listed in the
  documentation
• Added the LINKERD2_PROXY_INBOUND_PORTS environment variable during proxy
  injection which will be used by ongoing policy changes
• Added client-go cache size metrics to the diagnostics controller-metrics
  command
• Added validation that the certificate provided by an external issuer is a CA
  (thanks @rumanzo!)
• Added metrics support for ReplicaSets
• Replaced the request_errors_total metric with two new metrics:
  inbound_http_errors_total and outbound_http_errors_total
• Introduced the inbound_tcp_accept_errors_total and
  outbound_tcp_accept_errors_total metrics which count proxy errors
  encountered before a protocol can be detected