* Chore: adapt `create_source_release.sh` to make it runnable on Linux.
* Add `package` to `.proto` files, prevent polluting top-level namespace in some languages; The OAP server supports previous agent releases, whereas the previous OAP server (<=8.3.0)won'trecognizeneweragentssincethisversion(>= 8.4.0).
* Add ElasticSearch 7.10 to test matrix and verify it works.
* Replace Apache RAT with skywalking-eyes to check license headers.
#### Java Agent
* The operation name of quartz-scheduler plugin, has been changed as the `quartz-scheduler/${className}` format.
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@@ -89,6 +90,10 @@ Release Notes.
* Fix dashboard wrong instance.
* Add a legend for the topology.
* Update the condition of unhealthy cube.
* Fix: use icons to replace buttons for task list in profile.
* Fix: support `=` in the tag value in the trace query page.
* Add envoy proxy component logo.
* Chore: set up license-eye to check license headers and add missing license headers.
#### Documentation
* Update the documents of backend fetcher and self observability about the latest configurations.
1. Build distribution from source code package (apache-skywalking-x.y.z-src.tar.gz) by following this [doc](https://github.com/apache/skywalking/blob/master/docs/en/guides/How-to-build.md#build-from-apache-source-code-release).
1.Apache RAT check. Run `./mvnw apache-rat:check`. (No binary in source codes)
1.Check Apache License Header. Run `docker run --rm -v $(pwd):/github/workspace apache/skywalking-eyes header check`. (No binary in source codes)