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

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

* Refactor service instance inventory to properties based entity.

* Fix a bug and refactor properties update.

* plugin support redisson

* Support Gson plugin

* Fix application cannot start when the dubbo interface with @RequestMapping

* fix add Canal plugin

* fix add UnitTest

* fix   format pom.xml

* Delete CanalApplication.java

* fix support cluster url

* fix add Licensed

* fix bug

* fix

* Support webflux and spring mvc 5 plugin

* Change instrumentation

* Change instrumentation

* fix check style

* Add support 2.1.x instrumentation

* Support overwrite tag

* Fix test case

* Fix support rabbitmq plugin

* fix Unit test rename sw3 to sw6

* Update pom.xml

* fix adjust rabbitmq Unit test

* fix add rabbitmq component in docker component-libraries.yml

* Update RabbitMQProducerInterceptor.java

* Update RabbitMQProducerInterceptor.java

* feat:Active System.env Config In Both Collector And agent.config.
1、moving related codes into apm-util module.
2、update Setting-override.md about how to use.

* resolve docs.

* typo

* finish test case.

* Update README.md

* Fix the components of Spring resttemplate is incorrect

* Fix check style

* Fix the version is incorrect

* Fix checkstyle

* Close the clients which are unreachable.
Remote client manager test case and comments.

* Test the GRPCRemote client.

* 1. Catch the throwable for onComplete method cause of it will throw exception when connection lost.
2. Check the gRPC channel state, send message when state is ready, wait 5 second when state is not ready.

Notice: gRPC channel getState with true parameter will trigger reconnect operation.

* gRPC client will reconnect to the server when network recorvered.

* Recovery application.yml

* Recovery proto module commit id.

* no message

* Fixed compile error.

* Update new protocol

* Support new protocol at agent side.

* Fix test case.

* Make backend supports new trace protocol

* Fix tests.

* Make all new services available in gRPC.

* Fix bugs.

* Finish new document for v2 trace protocol.

* Fix wrong version requirement of zk

* Fix trace query bug.

* Find a client side dictionary bug.

* Fix register bugs.

* Fix break doc links.

* fix bug #1912

* fix bug #1912, recommit

* Fix custom HystrixConcurrencyStrategy/CommandExecutionHook doesn't work when using hystrix plugin

* add unit-tests

* add licenses

* Add some supports to sw6 header. Break many test cases because I turn sw3 default off. For sure, you could open in agent.conf.  FYI @peng-yongsheng @ascrutae

* Fix CI and make user cases still work under v1 header.

* Support BASE64 in v2 header and make entryOperationName and parentOperationName optional in ContextCarrier or ContextSnapshot

* Fix CI.

* @peng-yongsheng This is backend related, please pay attention.

* Fix the carrier item order is incorrect (#1903)

* Copies Base64 from Zipkin

This copies the last copy of Base64 from Zipkin which can avoid a
dependency on specific JRE. Notes in javadoc show its heritage. We
didn't have unit tests: they can be backported from the source:

https://github.com/square/okio/blob/cc1f5612506f86726c996be6b837b616892e12de/okio/src/test/kotlin/okio/ByteStringTest.kt#L230

Thanks to @swankjesse who created the eldest github ancestor :P

* Adds last version of encoding

* Support for overriding config with agent options

* Test the separator of options

* support quotes in agent options

* revert imports change

* add more tests

* clear properties after each test

* add document

* fix code style

* Lock oracle and resin plugins version.

* Move resin and oracle plugin to openskywalking

* Restore submodule active.

* Add another submodule active command.

* Remove the wrong test cases in release and fix some doc issues.

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

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

* Fix some doc

* Make sure heartbeat working always. cc @liuhaoyang make sure .net agent hasn't this issue.

* FIx CI.

* Fix mesh receiver doesn't update heartbeat.

* Fix bug of mesh heartbeat and rest receiver.

* Fix issue: opencensus is included in agent without shade. @tuohai666

* Avoid service inventory object concurrency situation.

* Fix concurrency for minute persistence and others

* Fix document todo.

* Update license. Fix package with dirty agent plugin jar files.

* Fixed not combine error in persistence register worker.

* Revert reset feature.

* Set default dist alarm settings and make dist package setting files right.

* Support empty list.

* H2 storage code skeleton.

* Add batch dao for H2.

* Fix wrong refactor.

* Add codes of other dao. No metric dao, wait for @peng-yongsheng new PR.

* Change license of distribution

* Add topology query in H2.

* Add more daos.

* Add some daos.

* Commit all H2 daos. Wait @peng-yongsheng to submit new IAggregationQueryDAO interface.

* Fix some CIs

* Fix wrong refactor, which causes h2 plugin failure.

* Fix all codes of H2 storage. :) and CI should pass. No test.

* Fix CI and typo

* Fix connection closed.

* Fix register bug

* no message

* Fixed service inventory register bug.

* Fix a compile issue.

* Sync change

* Reset es as default storage.

* Fix rat

* Fix H2 compile issue.

* Fix bugs for H2 storage.

* Fix bug in mesh.

* 1. Fix Thermodynamic query bug
2. Fix service inventory query bug
3. Fix missing traceid in trace query bug

* Fix query bug.

* Submit reverse caused by prev PR.

* Fix duplicate spans.

* Use H2 as default storage implementor.

* Fix bug in topology query.

* Fix CI

* Fix rat

* Fix two query in H2 storage.

* Fix H2 query

* Make release running in H2 mode and develop mode running is ES mode in default

* Manually trigger agent registration and write registration status to file

* Delete unused variables

* Code optimization, encapsulating some methods

* add clear DataCarrier function

* revert SkyWalkingAgent

* Optimize code and logic, including updating applicatin_id in unRegisterOperationNames

* Server end metadata loss notification

* Server end metadata loss notification

* fix file stream close and other problem

* revert to old

* fix some bug
Signed-off-by: NLiu-XinYuan <879928098@qq.com>

* fix some bugs in agent reset

* add close inputStream and fileChannel and fix some bug

* fixed some bugs