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Change notes for edge-20.7.5 (#4816) 

* Change notes for eddge-20.7.5
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# Changes
## edge-20.7.5
This edge brings a new approach to multicluster service mirror controllers and
the way services in target clusters are selected for mirroring.
The long-awaited Bring-Your-Own-Prometheus case has been finally addressed.
Many other improvements from our great contributors are described below. Also
note progress is still being made under the covers for future support for Service
Topologies (by @Matei207) and delivering image builds in multiple platforms (by
@aliariff).
* Multicluster
* Replaced the single `service-mirror` controller, with separate controllers
that will be installed per target cluster through `linkerd multicluster
link`. More info [here](https://github.com/linkerd/linkerd2/pull/4710).
* Changed the mechanism for mirroring services: instead of relying on
annotations on the target services, now the source cluster should specify
which services from the target cluster should be exported by using a label
selector. More info [here](https://github.com/linkerd/linkerd2/pull/4795).
* Added new section in the dashboard for exposing multicluster gateway metrics
(thanks @tharun208!)
* Prometheus
* Added `global.prometheusUrl` to the Helm config to have linkerd use an
external Prometheus instance instead of the one provided by default.
* Added ability to declare sidecar containers in the Prometheus Helm config.
This allows adding components for cases like exporting logs to services
such as Cloudwatch, Stackdriver, Datadog, etc. (thanks @memory!)
* Upgraded Prometheus to the latest version (v2.19.3), which should consume
substantially less memory, among other benefits.
* Other
* Fixed bug in `linkerd check` that was failing to wait for Prometheus to be
available right after having installed linkerd.
* Added ability to set `priorityClassName` for CNI DaemonSet pods, and to
install CNI in an existing namespace (both options provided through the CLI
and as Helm configs) (thanks @alex-berger!)
* Added support for overriding the proxy's inbound and outbout TCP connection
timeouts (thanks @mmiller1!)
* Added library support for dashboard i18n. Strings still need to be tagged
and translations to be added. More info
[here](https://github.com/linkerd/linkerd2/pull/4803).
* In some Helm charts, replaced the non-standard
`linkerd.io/helm-release-version` annotation with `checksum/config` for
forcing restarting the component during upgrades (thanks @naseemkullah!)
* Upgraded the proxy init-container to v1.3.4, which comes with an updated
debian-buster distro and will provide cleaner logs listing the iptables
rules applied.
## edge-20.7.4
This edge release adds support for the new Kubernetes