* Finish the APIs of telemetry module.

* Add prometheus license.

* Active default telemetry provider.

* add ojdbc component id

* Support Gson plugin

* Update submodule skywalking-ui

* Update submodule skywalking ui

* Update README.md

* Update README.md

* Fix doc.

* Fix typo

* fix incorrect version in apm-checkstyle.

* remove SNAPSHOT in checkstyle module.

* fix classloader dead lock in jdk7+

* support springcloud fegin 2.x

* update pom

* fix checkstyle

* fix checkstyle

* Update pom.xml

* cn doc

* cn doc

* cn doc

* cn doc

* cn doc

* delete cn default readme

* Fix application cannot start when the dubbo interface with @RequestMapping

* Refactor register API for making integration easier.

* Fix wrong refactor.

* Update powered-by.md

* Update powered-by.md

I change the order. This list should be in alphabeta order.

* fix add Canal plugin

* fix add UnitTest

* fix   format pom.xml

* Delete CanalApplication.java

* fix support cluster url

* fix add Licensed

* fix bug

* fix

* Update submodule ui

* Update LICENSE

* Update: add d3 license

* sync settings file

* add mysql

* Change srcLayer to nodeType. Add nodeType in service inventory entity.

* NodeType value refactor.

* Format codes.

* Fix compile issue.

* Fix bugs, and make query on service inventory instead of network inventory

* Update powered-by.md

add company startdt

* Update powered-by.md

Change order

* Update How-to-release.md

The public gpg file name should be KEYS, not KEY. It will contains other PMCs public key in this file after you export from the gpg tools.

* Update powered-by.md

* Update powered-by.md

Adjust order. And highlight order.

* add User Case

* add User Case

osName and hostName values are reversed。

* modify code style

* ci