* fix elasticsearch query data window size too large error.

* make query max window size configurable.

* Is it a typo or not?

* delete datasource-settings.properties

* handle 'metadataQueryMaxSize'

* delete DynamicModuleConfig.java

* modify mysql config

* parsing yaml to support the configuration for multiple properties

* delete datasource-settings.properties

* modify doc

* add properties for docker-entrypoint.sh

* add testLoadConfig()

* Support namespace in Nacos cluster/configuration

* Give Nacos default namespace as per config/registry

* Provide Consul dynamic configuration center implementation

* Add more unit tests

* Fix unit test

* Add more unit tests and remove unused file

* Remove redundant doc

* Add TTL E2E test

* Add to Jenkins stage and minor bugfix

* Upgrade e2e container version

* Polish and minor fix

* Polish

* support es https ssl config.

* update

* update docs.

* refactoring var name.

* fix

* update docs.

* add config in es section.

* fix logical.

* support ACL

* support digest only

* support elasticsearch address configuration with http scheme.

* update logical.

* Support etcd configuration.

* Feature of database session

* Make it configurable.

* Make the OAP server can't startup.

* Improve OAP server performance.

* configration-zookeeper

* Add cluster-etcd-plugin

* 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

* 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.

* Add ALS proto and receiver in envoy

* 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

* 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

* 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

* Finish the APIs of telemetry module.

* Add prometheus license.

* Active default telemetry provider.

* 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.

2. Zookeeper implementation of the cluster module using name space to support using same zookeeper cluster by different OAP clusters.

* Correct namespace description

* 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.

* support set config from system.envs.

* Change some codes to make zipkin receiver works, not done yet.

* @adriancole Zipkin receiver is coming back again.

* Fix document and fix for Zipkin receiver.

* Fix some bugs.

* Fix register bug.

* Fix transfer bug for new backend core.

* ZooKeeper Version Compatibility

* Update backend-cluster.md

Reorganize words. cc @peng-yongsheng

* Update application.yml

* Update application.yml

* Add more documents for v6.

* Make default setting consistent .