* [maven-release-plugin] prepare release v9.1.0

* [maven-release-plugin] prepare for next development iteration

* Upgrade OAP dependencies zipkin to 2.23.16, H2 to 2.1.212, Apache Freemarker to 2.3.31, gRPC-java 1.46.0, netty to 4.1.76.
* Upgrade Webapp dependencies, spring-cloud-dependencies to 2021.0.2, logback-classic to 1.2.11

* Upgrade OAP dependencies gson(2.9.0), guava(31.1), jackson(2.13.2), protobuf-java(3.18.4).
* Remove commons-pool and commons-dbcp from OAP dependencies(Not used before).
* Upgrade webapp dependencies gson(2.9.0), spring boot(2.6.5), jackson(2.13.2.2), spring cloud(2021.0.1).

* Fix license.

* Remove log4j version properties.

* Fix change log.

* [maven-release-plugin] prepare release v8.8.0

* [maven-release-plugin] prepare for next development iteration

* Create changes-8.8.0.md

* Reset changelog for 8.9.0

* [maven-release-plugin] prepare release v8.7.0

* [maven-release-plugin] prepare for next development iteration

* Introduce trivy to scan images
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Fix CVE
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Update licenses
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Remove log4j 1.x
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Update CHANGES.md
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Update LICENSE refer to webapp
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Update frontend-maven-plugin to 1.11.0, for Download node x64 binary on Apple Silicon.

* Update CHANGES.md

* Update CHANGES.md
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* [maven-release-plugin] prepare release v8.4.0

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.3.0

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.2.0

* [maven-release-plugin] prepare for next development iteration

* Upgrade dependencies and make the JDK11 compiling passed.

* Update license and fix license check file.

* Add CI for JDK11 compiling.

* Update doc.

* [maven-release-plugin] prepare release v8.1.0

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v8.0.0

* [maven-release-plugin] prepare for next development iteration

* Remove all shardingsphere cases.

Here are the list of changes we made in this pull request. Top 3 are the principle changes, others are following these principles.
1. New agent and mesh report protocol. 
2. New agent header protocol. 
3. Service register, instance register and network address register have been removed permanently.
4. Service traffic, instance traffic and network alias metrics are added to replace the service, instance and network address inventory.
5. Register process has been removed.
6. Metrics stream process supports insert only mode, especially for traffic entities.
7. Metrics stream process supports no-downsampling mode for traffic entities and network alias.
8. Remove all register mechanism and cache in the java agent.
9. Remove MONTH step in GraphQL query.
10. Update UI to remove MONTH step query, the max query range is 60 days now.
11. Simplify the TTL to metrics and record. And the unit has been formatted in Day unit. No specific TTL for ElasticSearch storage.
12. Buffer mechanism of trace receiver and mesh receiver has been removed due to no register.
13. New service id, instance id and endpoint id rules, including service relation, instance relation and endpoint relation id rules.
14. Java agent support `keep tracing` mode, meaning, agent generating tracing context even the backend is unconnected/unavailable.
15. Plugin test tool up to date, in order to support new protocol.
16. Plugin tests expected data files updated.
17. E2E tests updated.
18. Telemetry of Grafana config has been merged into one.
19. Documentation updates.
20. [TBD] InfluxDB storage implementation is not available, need @dmsolr to fix later, in order to reduce the master change block by this PR.

* [maven-release-plugin] prepare release v7.0.0

* [maven-release-plugin] prepare for next development iteration

Motivation:

Review code styles with some bots automatically.

Modifications:

Set up ReviewDog in GitHub Action to review code style.

Add more check rules to checkstyle plugin.

Result:

Obvious code styles can be reviewed and commented automatically.

* [maven-release-plugin] prepare release v6.6.0

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v6.5.0

* [maven-release-plugin] prepare for next development iteration

* [CI] Make E2E tests run in multiple JDK versions

* Polish

* Use new e2e-container version number

* Install socat in reboot case

* Fix reboot case

* Polish

* Reorganize jobs

* Add tests on webapp to increase test coverage

* Rename test class

* Add tests on webapp to increase test coverage

* Fix unit tests

* Remove duplicated class

* [maven-release-plugin] prepare release v6.4.0

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v6.3.0

* [maven-release-plugin] prepare for next development iteration

* [maven-release-plugin] prepare release v6.2.0

* [maven-release-plugin] prepare for next development iteration

* Move submodule plugin.

* Always auto-submodule

* [maven-release-plugin] prepare release v6.1.0

* [maven-release-plugin] prepare for next development iteration

* Change keys location.

* [maven-release-plugin] prepare release v6.0.0-GA

* [maven-release-plugin] prepare for next development iteration