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update changelog for edge-20.7.2 (#4741) 

This edge release moves Linkerd's bundled Prometheus into an add-on.
This makes the Linkerd Prometheus more configurable, gives it a separate
upgrade lifecycle from the rest of the control plane, and allows users
to disable the bundled Prometheus instance. In addition, this release
includes fixes for several issues, including a regression where the
proxy would fail to report OpenCensus spans.

* Prometheus is now an optional add-on, enabled by default
* Custom tolerations can now be specified for control plane resources
  when installing with Helm (thanks @DesmondH0!)
* Evicted data plane pods are no longer considered to be failed by
  `linkerd check --proxy`, fixing an issue where the check would be
  retried indefinitely as long as evicted pods are present
* Fixed a regression where proxy spans were not reported to OpenCensus
* Fixed a bug where the proxy injector would fail to render skipped port
  lists when installed with Helm
* Internal improvements to the proxy for lower latencies under high
  concurrency
* Thanks to @Hellcatlk and @surajssd for adding new unit tests and
  spelling fixes!
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Eliza Weisman 2020-07-09 14:48:47 -07:00 committed by GitHub
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# Changes # Changes
## edge-20.7.2
This edge release moves Linkerd's bundled Prometheus into an add-on. This makes
the Linkerd Prometheus more configurable, gives it a separate upgrade lifecycle
from the rest of the control plane, and will allow users to disable the bundled
Prometheus instance. In addition, this release includes fixes for several
issues, including a regression where the proxy would fail to report OpenCensus
spans.
* Prometheus is now an optional add-on, enabled by default
* Custom tolerations can now be specified for control plane resources when
installing with Helm (thanks @DesmondH0!)
* Evicted data plane pods are no longer considered to be failed by `linkerd
check --proxy`, fixing an issue where the check would be retried indefinitely
as long as evicted pods are present
* Fixed a regression where proxy spans were not reported to OpenCensus
* Fixed a bug where the proxy injector would fail to render skipped port lists
when installed with Helm
* Internal improvements to the proxy for lower latencies under high concurrency
* Thanks to @Hellcatlk and @surajssd for adding new unit tests and spelling
fixes!
## edge-20.7.1 ## edge-20.7.1
This edge release features the option to persist prometheus data to a volume This edge release features the option to persist prometheus data to a volume