* Revert SolrJ plugin.
* Remove an unexpected test case.
* Revert "Remove an unexpected test case."
This reverts commit 359990e18b0c0ae1a6e1005ff985bf237ec05619.
* Clear context.
* Fix a leak.
* 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
* feat:Active System.env Config In Both Collector And agent.config.
1、moving related codes into apm-util module.
2、update Setting-override.md about how to use.
* resolve docs.
* typo
* finish test case.
* Update README.md
* Update new protocol
* Support new protocol at agent side.
* Fix test case.
* Make backend supports new trace protocol
* Fix tests.
* Make all new services available in gRPC.
* Fix bugs.
* Finish new document for v2 trace protocol.
* Fix wrong version requirement of zk
* Fix trace query bug.
* Find a client side dictionary bug.
* Fix register bugs.
* Fix break doc links.
* Replace v5 changes by a link to 5.x branch. New v6 changelog.
* Finish query doc and fix a missing field in alarm doc.
* Add link to official oal in alarm doc.
* Fix words.
* Fix some doc
* Update README.md
* Update README.md
* Update README.md
* Update README.md