* 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

Using Mongo 2.14.3, we found that :" java. lang. ClassNotFoundException: Can't find MongoDBCollection Method Interceptor",  must use "org.apache.skywalking.apm.plugin.mongodb.v2.MongoDBCollectionMethodInterceptor" to solve this problem.

* Add Undertow 2.x plugin

* Undertow: Interceptor method executeRootHandler in class Connectors

* Change version number to 6.0.0-alpha-SNAPSHOT

* Support alarm message.

* Fix document words.

* Support alarm hook.

* Fix javadoc issue.

* Sync submodule

* Sync submodule

* Add ignore to bytebuddy agent.

* Fix a wrong name.

* Make sure toolkits are excluded.

* Fix CI

* Format codes.

* Remove MethodGraph compiler

* fix memory leak in HystrixPlugins

* update 5.x grpc version form 1.10 to 1.14 and  Solve the resulting guava and log4j version conflicts

* Specify guava version 20.0

* update parrent pom guava version

* Fix bug stop stopSpan when not createSpan

* Fix bug stop stopSpan when not createSpan

* change the agent log level to millisecond

* add the function of the specified-agent-config

* Update README_ZH.md

* Use -D  to set the specified config path

* add docs

* update docs

* change method name

* add link

* change the function name

* change the key

* format doc

* Fix bug stop stopSpan when not createSpan

* Fix bug stop stopSpan when not createSpan

* change the agent log level to millisecond

* Fix bug stop stopSpan when not createSpan

* Fix bug stop stopSpan when not createSpan

* change the agent log level to millisecond

* [Agent] Provide plugin for Elasticsearch 5.x

Add [Agent] Elasticsearch transport client plugin

fix component name

add elasticsearch component

add elasticSearch component into component-libraries.yml

* update support list

* update PlainListenableActionFutureInterceptor.java

* fix set span attributes

* clear runtimeContext

* remove extra plugins

* Moves to Maven wrapper to stabilize the version in use

This will ensure those building will have similar experience due to
having a fixed maven version.

* Updates most plugin versions and removes redundant configuration

* Sets up build enforcement for JDK 1.8 until further work occurs

* Fix bug stop stopSpan when not createSpan

* Fix bug stop stopSpan when not createSpan

Remove collector.servers and collector.direct_servers, and add collector.backend_service setting. cc @ascrutae