* Fix #2546

* Change the stackdepth type

* Fix bug

* Fix CI failed

* fix #2599

* fix ci

* add license

* add ActiveTag error methods

* fix

* fix

* nacos

* nacos

* nacos

* nacos

* fix ci

* support nacos cluster

* fix yml

* fix license

* fix ci

* remove optional

* update license

* update license and doc

* fix

* Rename metric to metrics.

* Fixed test case execute failure issues.

* support es query span max size.

* refactoring segmentQueryMaxSize.

* fix

* fix

* fix default MetadataQuery Max size.

* revert mysql

* vertx plugin impl

* Add SmartSql provider components in component-libraries config

* sync SmartSql provider setting -> fix https://github.com/apache/incubator-skywalking/issues/2390

* Added elasticsearch warehouse certification support

* Add the elasticsearch service for Http Basic instructions

* Update backend-storage.md

Change document.

* The role of OAP server.
Mixed: Receive agent data, level 1 aggregate, level 2 aggregate
Receiver: Receive agent data, level 1 aggregate
Aggregator: level 2 aggregate

* Mistake, stadalone default.

* Update application.yml

* #2327

Add a new module for share receiver server or to be a bridge of core server.

* Rename the module name.

* Extend envoy metric service, scope and OAL lexer/parser.

* Finish metric extension and oal.

* Make test env works.

* Finish test of envoy connection and memory metric.

* Change document.

* Finish docker compose test.

[Performance Improvement]Backend streaming thread model improvement

* Zookeeper plugin

* The prototype of topN sql worker.

* Add scope and new manual dispatcher.

* no message

* Finish topN persistence codes. Not test yet. And query have not added.

* Finish the top n database statement persistent.

* Support different slow thresholds for different db types.

* Fix wrong db default threshold

* Finish new query protocol binding.

* Provide query empty implementation and sync ui.

* Finish all codes, hope it works :P
I will run the tests tonight.

* Fix

* Fix

* Fix a startup issue.

* Add time bucket to persistent.

* Fix wrong query result column name.

* Fix Database query.

* Fix checkstyle.

* Fix wrong order logic, and add a test case to verify, to fix https://github.com/apache/incubator-skywalking/pull/2239#discussion_r255948249

* Support lettuce plugin

* lettuce plugin bugfix

* lettuce plugin fix license issue

* lettuce plugin fix cluster and config issue

* plugin lettuce compatible with low 5.0.x version

* lettuce plugin support version accurately describes on Supported-list.md

* plugin lettuce compatible with low 5.0.2 version

* lettuce plugin fix wrong batch method intercept point

* move lettuce to optional plugins

* fix ci issue

* fix ci issue

* Modify the description file

* Pom code optimization

* Optimization operation name

* Optimization operation name2

* plugin support redisson

* remove duplicate config in docker.

* Revert "remove duplicate config in docker."

This reverts commit eb774035

* update content.

* Finish the APIs of telemetry module.

* Add prometheus license.

* Active default telemetry provider.

* add ojdbc component id

* Support Gson plugin

* fix add Canal plugin

* fix add UnitTest

* fix   format pom.xml

* Delete CanalApplication.java

* fix support cluster url

* fix add Licensed

* fix bug

* fix

* sync settings file

* add mysql

* Provide consul cluster plugin.

* Change log and application config file.

* Add consul's config item into the docker's application.yml.

* Fixed bug.

* Add consul description into  readme.

* Add okhttp component license.

* 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

* Support sampling trace at server side and keep metric right.

* Add a trace sampling document

* Fix wrong default value.

* Fix document issue.

* Fix assemble issue.

* Fix wrong settings and doc.

* add system env in docker configuration

* remove the zipkin config

* Update submodule skywalking-ui

* Add docker compose cofig files.

* Update submodule skywalking-ui

* Refactor kubernetes config

* Add ui image