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Edge-20.2.2 release notes (#4077) 

* Edge-20.2.2 release notes
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## edge-20.2.2
This release includes the results from continued profiling & performance
analysis on the Linkerd proxy. In addition to modifying internals to prevent
unwarranted memory growth, new metrics were introduced to aid in debugging and
diagnostics.
Also, Linkerd's CNI plugin is out of experimental, check out the docs at
https://linkerd.io/2/features/cni/ !
* CLI
* Added support for label selectors in the `linkerd stat` command (thanks
@mayankshah1607!)
* Added scrolling functionality to the `linkerd top` output (thanks
@kohsheen1234!)
* Fixed bug in `linkerd metrics` that was causing a panic when port-forwarding
failed (thanks @mayankshah1607!)
* Added check to `linkerd check` verifying the number of replicas for Linkerd
components in HA (thanks @mayankshah1607!)
* Unified trust anchors terminology across the CLI commands
* Removed some messages from `linkerd upgrade`'s output that are no longer
relevant (thanks @supra08!)
* Controller
* Added support for configuring service profile retries
`(x-linkerd-retryable)` via OpenAPI spec (thanks @kohsheen1234!)
* Improved traffic split metrics so sources in all namespaces are shown, not
just traffic from the traffic split's own namespace
* Improved linkerd-identity's logs and events to help diagnosing certificate
validation issues (thanks @mayankshah1607!)
* Proxy
* Added `request_errors_total` metric exposing the number of requests that
receive synthesized responses due to proxy errors
* Helm
* Added a new `enforcedHostRegexp` variable to allow configuring the
linkerd-web component enforced host (that was previously introduced to
protect against DNS rebinding attacks) (thanks @sannimichaelse!)
* Internal
* Removed various es-lint warnings from the dashboard code (thanks
@christyjacob4 and @kohsheen1234!)
* Fixed go module file syntax (thanks @daxmc99!)
## stable-2.7.0
This release adds support for integrating Linkerd's PKI with an external