This edge release adds functionality to the CLI to output more detail and
includes changes which support the multi-cluster functionality. Also, the helm
support has been expanded to make installation more configurable. Finally, the
HA reliability is improved by ensuring that control plane pods are restarted
with a rolling strategy
* CLI
* Added output to the `linkerd check --proxy` command to list all data
plane pods which are not up-to-date rather than just printing the first
one it encounters
* Added a `--proxy` flag to the `linkerd version` command which lists all
proxy versions running in the cluster and the number of pods running
each version
* Lifted requirement of using --unmeshed for linkerd stat when querying
TrafficSplit resources
* Added support for multi-stage installs with Add-Ons
* Controller
* Added a rolling update strategy to Linkerd deployments that have
multiple replicas during HA deployments to ensure that at most
one pod begins terminating before a new pod ready is ready
* Added a new label for the proxy injector to write to the template,
`linkerd.io/workload-ns` which indicates the namespace of the workload/pod
* Internal
* Added a [security policy](https://help.github.com/en/github/managing-security-vulnerabilities/adding-a-security-policy-to-your-repository)
to facilitate conversations around security
* Helm
* Changed charts to use downwardAPI to mount labels to the proxy container
making them easier to identify
* Proxy
* Changed the Linkerd proxy endpoint for liveness to use the new `/live` admin
endpoint instead of the `/metrics` endpoint, because the `/live` endpoint
returns a smaller payload
* Added a per-endpoint authority-override feature to support
mutli-cluster gateways