* Add config to control tracing sql parameters

* Update ES-Server-FAQ.md

[Thread Pool](https://www.elastic.co/guide/en/elasticsearch/reference/6.3/modules-threadpool.html?nsukey=W48pJFXgvLgtyfM%2FXI%2FQ8BhcPYE0WjNFGwKD%2Bv0cjUkocQhh1FCPQwklwVBOec541GcUkX899f%2FQv5ikjA8ckqdcrlVHpjATTKbJarNA1Gr%2BltpTiDJe%2FMuqrZGa0CAkbLfIGrYqMyc0s%2BlkxFr%2BzEo2hmWsgMaPZvK9K6f9Xugz0k0v1Wb2nfeex8ZQn0Y9SFEHwRaYV5uzw8rnH9I%2BGg%3D%3D)

From this document, we can find that the bulk thread pool setting is deleted.

write
For single-document index/delete/update and bulk requests. Thread pool type is fixed with a size of # of available processors, queue_size of 200. The maximum size for this pool is 1 + # of available processors.

* Update ES-Server-FAQ.md

* configration-zookeeper

* restore solrj-plugin

* restore solrj-plugin

* Provide Apollo dynamic configuration center implementation. fixes #2825

* Update backend-alarm.md

* Update backend-alarm.md

* Revert SolrJ plugin.

* Remove an unexpected test case.

* Revert "Remove an unexpected test case."

This reverts commit 359990e18b0c0ae1a6e1005ff985bf237ec05619.

* Clear context.

* Fix a leak.

* Adjust pom plugin position and add docs

* Polishing

* Update as requested

* Create ES-Server-FAQ.md

* Update README.md

* Update ES-Server-FAQ.md

* Provide Nacos dynamic configuration center implementation. fixes #2816

* Add unit tests

* Sync

* Replace pull-mode with watch-mode

* Fix ci

* Unify dependency management

* Add integration tests

* Revert unexpected changes

* Add more test cases

* Revert unexpected changes

* Suppress IDE warning

* Correctify volumes position

* Add license header

* Remove Chinese comments

* Sync

* Sync

* Sync

* Sync

* Revert unexpected changes

* Rebase on refactored code and add missing config to docker

* Fix unit test

* Revert unnecessary changes

* new branch for solrj-plugin

* rollback and add module solrj-plugin

* preparing to pr

* to resolve reviewers' suggestions

* remove unused code

* remove unused code

* remove unused comments

* To avoid NPE

* fix typo

* Change to JRE6

* fix pom.xml merge incorrectly. and java.net.URL instead of Regex

* Using RuntimeContext instead of ThreadLocal

* To reduce unnecessary tags

* add test cases

* fix validation fail

* add solrj-plugin into component-libraries & Supported-list

* to trace all patch to avoid recheck status of span

* remove unnecessary properites

* remove unnecessary tags

* Add the config to document of setup

* Implement the base of config API module.

* Finish configuration module codebases w/o tests, revert some changes.

* Finish mock tests.

* Add new gRPC service for configuration.

* Make gRPC configuration sync provider works.

* Add database slow statement dynamic setting.

* Finish the dynamic configuration service.

* Fix version.

* The new feature of Elasticsearch storage with the time series implementation.

* Time bucket util improve.

* Fixed some Gramma error.

* Update ttl.md

Polish English a little.

* Update ttl.md

Add more explicit description of TTL

* Update ttl.md

* Update StorageModuleElasticsearchConfig.java

Set otherMetricsDataTTL = 0 as default, make user more clear.

* Rename the timeSeriesAble to capableOfTimeSeries

* Fixed a test case failure.

* merge

* merge

* Provide plugin for ShardingSphere (#2699)

* Provide plugin for ShardingSphere (#2699)

* Provide plugin for ShardingSphere (#2699)

* adjust package name (#2699)

* fix mvnw (#2699)

* revert files access permission from 644 to 755

* change the access permission from 644 to 755

* change files access permission from 644 to 755

* revert all no changes files

* feat(agent sdk): resteasy plugin

* fix(agent sdk): fix component define

* fix(agent sdk): fix file license

* fix(agent sdk): fix file license

* docs(agent sdk): add supported list

* fix(agent sdk): fix file license

* fix(agent sdk): fix response error tag

* fix(agent sdk): fix

* fix(agent sdk): adapter 3.5+

* fix(agent sdk): remove unreasonable async handling

* spring cloud gateways plugin

* Add ALS proto and receiver in envoy

* Link Go agent project in main repo.

* Fix link.

* Update docker building of oap server

 * generating appliation.yml according to enviroment variables
 * adding Makefile to build binary and docker image

* Update ui docker

* Update docker-compose

* Update document

* Update document

* Merge from master

* Reset skywalking-ui

* Provide plugin for ShardingSphere (#1933)

* 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

* Fix #2546

* Rename metric to metrics.

* Fixed test case execute failure issues.

fix doc_Trace Data Protocol v2_error #2620

* Introduce new profile in release

* Fix a missing change.

* Fix wrong profile name.

* 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.

Update all "incubator-skywalking" to "skywalking" ,"incubator-servicecomb-java-chassis" to "servicecomb-java-chassis" correctly, and ".gitmodules" will update at #2531 (#2548)

* Set RocketBot as primary UI in doc

* Update submodule.

* vertx plugin impl