* New query graphql protocol added.

* Finish a new metric, log(abstract) with HTTP Access Log.

* Submit the draft codes of logs.

* Remove @IDColumn

* Fix startup issue.

* Add http_access_log to disable list.

* Finish a wrong service implementation.

* Add trace id in log query condition and result.

* Fix style

- found the unnecessary else block and remove it
- add test cover when AMQP.BasicProperties had null headers or headers Map had null value keys

issue #2450

* Fix npe

Make the Istio img address available.

* Make Jaeger receiver works in 12450 as default.

* Finish compile and codebase.

* Make codes runnable.

* Finish Jaeger query tests.

* Add document for jaeger receiver.

* Add readme.

* Fix a break link.

* Finish doc.

* Fix missing licenses in dist.

* Move all CoreRegisterLinker together into SharingReceiver.

* Setup receiver endpoint

* Revert "Provide create, delete, isExists template method by elastic client. (#2425)"

This reverts commit e6a7720f.

* Update powered-by.md

* Update powered-by.md

Change order

* Move all receiver proto files together, in case the class conflict in gogoproto.

* Add jaeger proto and its dependency proto. Also license provided.

* Fix rat.

* Codebase for zipkin span persistence.

* Fix missing fields in storage.

* Miss the latency field.

* Finish some tests.

* Fix wrong latency.

* Finish doc and reset application.yml

* Make the description more clear.

* 1. Remove static worker instances holder.
2. Remove static worker instance id generator.

* Fixed test case failure.

* support dubbo 2.7.x

* updated

* rename package

* rename package

* fix UT

* rename class

add 买道传感科技（上海）有限公司 to powered-by page

Change order.

* Add more logs

* no message

* no message

* Exclude test file.

* Try to make disable work.

* Make disable works.

* Add disable document.

1. Fixed the warning of 'parent.relativePath' points issue when running the mvn package command. (#2404)

2. Fixed the warning of duplicate declaration of plugin issue when running the mvn package command.
3. Fixed the warning of duplicate declaration of mysql connector jar when running the mvn package command, because of provided scope include test scope.
4. Fixed the warning of expression ${artifactId} is deprecated issue when running the mvn package command.
5. Fixed the warning of expression ${version} is deprecated issue when running the mvn package command.

* Support endpoint group in mesh.

* Fix CI.

* Refactor for reduce string compare.

* Support endpoint naming rule in service level

* Support grpc exporter.

* Support scope(all) metric export and finish document.

* Close exporter even in local debug env. And fix CI.

* Remove the system.out

* Fix absent 4.

* Support subscription from remote.

* Add the doc

* Update application.yml

* Downstream command protocol example.

* Add wait seconds arguments into meta data reset command.

* Style consistent issue fixed.

* Add serialNumber arguments for agent to check if the command duplicate.

* Command separate.

* Update TraceIgnoreCommand.java

Keep TraceIgnoreCommand just named `TraceIgnore`

Add catalog to ScopeDeclaration annotation. Make the alarm adapt to it. Now more metric could go through alarm, such as JVM, CLR. (#2391)

* 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.