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Edge-20.9.1 release notes (#4942) 

## edge-20.9.1

This edge release contains an important proxy update that allows linkerd to
continue to operate normally in HA during node outages. We're also adding full
Kubernetes 1.19 support!

* Improved the proxy's error handling for DNS errors encountered when
  discovering control plane addresses, which can be common during installation,
  before all components have been started
* The destination and identity services had to be made headless in order to
  support that new controller discovery (which now can leverage SRV records)
* Use SAN fields when generating the linkerd webhook configs; this completes the
  Kubernetes 1.19 support which enforces them
* Fixed `linkerd check` for multicluster that was spuriously claiming the
  absence of some resources
* Improved the injection test cleanup (thanks @zhouhao3!)
* Added ability to run the integration test suite using a cluster in an ARM
  architecture (thanks @aliariff!)
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# Changes
## edge-20.9.1
This edge release contains an important proxy update that allows linkerd to
continue to operate normally in HA during node outages. We're also adding full
Kubernetes 1.19 support!
* Improved the proxy's error handling for DNS errors encountered when
discovering control plane addresses, which can be common during installation,
before all components have been started
* The destination and identity services had to be made headless in order to
support that new controller discovery (which now can leverage SRV records)
* Use SAN fields when generating the linkerd webhook configs; this completes the
Kubernetes 1.19 support which enforces them
* Fixed `linkerd check` for multicluster that was spuriously claiming the
absence of some resources
* Improved the injection test cleanup (thanks @zhouhao3!)
* Added ability to run the integration test suite using a cluster in an ARM
architecture (thanks @aliariff!)
## edge-20.8.4
* Fixed a problem causing the `enable-endpoint-slices` flag to not be persisted