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

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

* GC time metrics should be total time.

* Add it to change log.

* FYI @hanamily you missed to change this in self observability.

* add http

* update plugin

* Add StaticMethodsAroundInterceptor to be injected.

* move to options plugin

* move folder

* update pom

* support https

* add witness class

* Make JDK9-11 available for bootstrap instrumentation

* Remove temp folder of old bootstrap instrumentation requirement.

* remove witness ,work for jdk6,7,8,9,10,11

* Make JDK 12 works.

* move jdk-http-plugin to bootstrap-plugins folder

* add httpsclient

* update README.md

* Support upgrade backend w/o rebooting agents

* Support etcd configuration.

1. All the inventories add last_update_time attribute,  delete the mapping_last_update_time attribute in service inventory. (#3168)

2. Fixed the service inventory and net address inventory update bugs.

* Feature of database session

* Make it configurable.

* Change the metrics process flow.
before: metrics entrance -> aggregate worker -> remote worker -> trans worker -> minute, hour, day, month persistence worker -> storage
after: metrics entrance -> aggregate worker -> remote worker -> minute persistence worker ->  trans worker -> hour, day, month persistence worker -> storage

* IntKeyLongValueHashMap instead of IntKeyLongValueArray.

* Make the OAP server can't startup.

* Finish

* Rename the method and fixed some test case issues.

* Rename field.

* no message

* Feature of database session

* Make it configurable.

* Change the metrics process flow.
before: metrics entrance -> aggregate worker -> remote worker -> trans worker -> minute, hour, day, month persistence worker -> storage
after: metrics entrance -> aggregate worker -> remote worker -> minute persistence worker ->  trans worker -> hour, day, month persistence worker -> storage

* First commit

* Fix e2e test and some nits

* Documenting so11y and setting default values of it in dev env

* Feature of database session

* Make it configurable.

* Make the OAP server can't startup.

* Refactor Persistence worker.

* 1. Provide InsertRequest and UpdateRequest interface for prepare persistence.
2. Implement the ids query for H2 metrics DAO.

* Refactor worker framework

* Use queue to receive asynchronous batch request.

* Rename the Datacarrier thread name.

* Fixed some mistake.

* New mistake.

Make agent mock works as usual.

2. Implement the ids query for H2 metrics DAO.

* Remove the worker id, and add worker name for remote handler only.

* Remote metrics and inventory classes mapping too.

* Refactor codes.

* Improve OAP server performance.

* Fixed the problem of dirty reading of the storage implementation of elasticsearch.

* Fixed a mistake.

* Change OAL generator tool to runtime.

Step 1. change project structure. API links and maven pom.

* Part of metrics class generation

* Metrcis class generated.

* Set up the basic structure of new OAL engine.

* Finish metrics generation.

* Support dispatcher generation.

* Format codes.

* Generate dispatcher all methods.

* Implement disable in hardcode.

* Clear up

* Fix compile startup.

* Update license and document of new OAL engine.

* Fix rat.

* Disable class output in default

* Copy from @kezhenxu94 's test PR, https://github.com/apache/skywalking/pull/3110

* Wait for the mount command to finish

* fix 3069

* Correct spelling errors in the network protocol.

* update protocol submodule commit id.

* Fix wrong logger name

* Fix more wrong logger names in agent side

* fix deleteIndex repeat append namespace

* fix deleteIndex repeat append namespace

* fix checkStyle

* fix

* fix test assert

* update test method name

* fix test

* fix

* del elastic.search.namespace

* fix check style

* update ITElasticSearchNamespaceClient to ITElasticSearchClientOfNamespace

* move undoFormatIndexName to ITElasticSearchClien

* move #getIndex to ITElasticSearchClient

* add deleteByModelName and deleteByIndexName

* add deleteByModelName and deleteByIndexName

* revert ITElasticSearchClient#getIndex

* Use whitebox get from powermock to get this.

* undo namespacePrefix

* Set up 10 seconds deadline after gRPC client sending
 * The duration of deadline contains three segments: connecting,
   request and response

For blocking stub, I just set deadline before invoke service. For
bi-streaming stub, I found all of them are used as a blocking style,
that after getting streaming response client stub just close current
streaming. Base on above reality, I pick the same way as blocking one.

* fix issue #2979

* remove the unused import, which causes the CI failed

* spring_async_plugin

* fix

* fix

* fix

* fix

* format fix

* rename

* fix

* fix version

* Update SWCallable.java

* Update Supported-list.md

* Update Supported-list.md

* Enhance module manager

* etcd configuration is not implemented and the provider definition is copied from cluster management, which could cause multiple loading by module manager.

* Fix a missing delete.

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

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