* sniffer processing profile task and report status and snapshot

* resolve testServiceDependencies test case error, use same register with `TraceSegmentServiceClient`

* resolve names

* change profile to single one thread run.

* 1. change to the ArrayList, because known the max size
2. rename issue resolved

* add profiling status enum

* change sniffer use full name issue

* 1. remove `prepareProfiling` method, build profiling status when construct `TracingContext`
2. add `TracingThreadListenerManager`, notify when tracing main thread finish
3. change ProfileThread start when process new profile task

* remove unnecessary getter

* add test assert error message

* adding `AgentServiceRule`

* revert original assert

* remove unnecessary getter

* resolve issues

* reduce findService invoke

* resolve style error

* recheck profiling when change first span operatin name

* resolve issues
1. remove `ContextManager#profilingRecheck`, only check on `TracingContext`
2. rename comments
3. resolve volatile array setting

* remove article link

* add `ProfileTask#maxSamplingCount` check

* resolve conflict (Downstream -> Commands)

* 1. change profilingSegmentSlots init on construct
2. if is profiling, recheck dont need to stop
3. total profiling count increment on first dump

* remove unused return val

* remove some `@param` and `@return`

* add profile task check result data bean

* change profiler slot to `AtomicReferenceArray`

* resolved java doc error

* fix doc error, remove meaningless descriptions

* resolve missed profile receiver on oap starter

* resolve method invoke error
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>
Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>

* Drop support of protocol v1 (sw3)

* Remove versioning logic further

* Remove more version5-only classes

* Commit missing files

* Update submodule and address review comment

* Fix failed tests

* Provide profile task downstream to sniffer

* fix agent unit testcase issue

* add profile switch config on sniffer

* fix es error

* 1. add @DefaultImplementor on the sniffer profile task service
2. change ProfileTaskExecutionService#PROFILE_TASK_READY_SCHEDULE to final and remove volatile
2. fix style error

* change timeFromStartMills use `<` to compare

* 1. add `maxSamplingCount` to profile task
2. make profile task limit to the common package

* 1. change `agent.active_profile` to `profile.active` and make true on default
2. add `maxSamplingCount` in profile task
3. use `createTime` to check has new command list
4. add task re-check before process profile task

* 1. add `profile-receiver` document
2. change `ProfileTaskExecutionService` use single schedule thread pool
3. cache dont need fetch data when no data, use auto-fresh mechanism only

* remove navigate time judge, fix comment wrong meaning

* Kotlin coroutine plugin write in Java
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Split the `collect_http_params` as per plugins for better performance

* Add missing change

Plugins of Tomcat, Spring MVC, Armeria are supported for now

* Add play-scenario

* Set play plugin as default
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>
Co-authored-by: NWeiyi Liu <liuweiyi@cmss.chinamobile.com>

* Move Webflux plugin into default list.

* Fix a typo.

* Move lettuce into default plugin

* Fix maven pom

* Update JDK compiling level to 8, and remove zip dist.

* Exclude annotation and shade API.

* Fix more exclusion.

* 1. Update grava and gson 2. Fix compile issue. 3. Keep protoc and maven plugin in old version. Some incompatible of 3rd party grpc proto.

* Fix dependency conflicts, license and notice issue, and dependency check script issue
Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>

* webflux-reactive

* add support version comment, modify gateway

* add test case, modify name

* add docs

* remove healthCheck

* Add Java agent plugin for Jdk Threading

* Fix expected data according to changes in master

* Update agent.config

* Fix failed plugin test

* Remove the local span and exit span register mechanism in Java agent scenario.

* Fix config, plugin, and document, as exit span is not required register anymore.

* Try to fix the test case expected data due to no register for exit span.

* Fix toolkit case.

* Remove exit span from plugin test framework document.

* Update protocol, FAQ, and CHANGELOG documents to highlight this change.

* Fix NPE when no entry span in the whole segment. Set endpoint to null in segment entity.

* Fix the snapshot and add inexistence operation name id.

* Fix several async cases.

* Fix undertow test case.

* Fix wrong error log name.

* Keep name consistent with 6.x concepts.

* Try to fix 3 async scenarios.

* Fix okhttp case.

* Fix Spring Async case.

* Fix another NPE

* Fix NPE when first span has no endpoint id when it is local or exit span.

* Still fill first operation name when no endpoint id.

* Update README.md

logging.dir 's Description is an Error .Default value is not System.out. It is a dir.

Add java agent deployment document for skywalking with jetty

* plugin code

* NPE FIX

* move FILTER_LENGTH_LIMIT

* fix checkstyle

* Add postgresql agent sql query param show

* Support timeout configuration in agent and backend.

* Fix CI

* no message

* Add feature to control the maximum history agent log files.

* Add Light4J 1.6.x plug-in

* Add unit test for Light4J plug-in

* Add missing id to server-starter

* Remove mentions of version 1.6.x

Some local testing showed that the plugin successfully generated traces for a light4j project built with light-codegen v2.x. Therefore, there is no need for a separate plugin for v2.x and no distinction needs to be made with light4j v1.6.x.

* Update supported light4j versions

* Use ContextSnapshot to maintain trace

In a typical Light4j project, the ExceptionHandler#handleRequest is the asynchronous execution point. The flow is ExceptionHandler#handleRequest -> HttpServerExchange#dispatch -> ... -> ExceptionHandler#handleRequest. This means that handleRequest is being intercepted twice and each time a LocalSpan is created. Without handling thread propagation, the trace segment gets split up.

By saving a ContextSnapshot into the enhanced object (ExceptionHandler), we can determine if it is necessary to continue the segment.

* Update logic for span creation in trace

By default, the Light4J plugin now overrides the Undertow plugin's entry span with its own. This new entry span is created just before execution of the ExceptionHandler#handleRequest in the I/O thread. The entry span is generated here because it is considered the starting point of the Light4J handler chain.

There is now also the option to enable detailed span creation when tracing requests through Light4J. These local spans mark which middleware and business handlers are involved with handling the HTTP request to a Light4J service.

* Update skywalking version

* Update light4j version

* Fix LightInstrumentation javadoc

* Remove import violating checkstyle

This import was added from the link reference in the javadoc. The javadoc has now been changed to just reference the method name.

* Move light4j agent config property

* Sync UI

* agent support custom properties.

* Support play 2.x 

* ADD: add operationName length threshold

* MOD:move operationName threshold to Config, simplified code

* MOD:update agent set-up document, clean code

* MOD:add agent.operation_name_threshold conf prefix

* Support op group name in agent config core.

* Provide core API for operation name grouping, rest template plugin update, and doc update.

* Fix doc

* Fix test case.

* Fix missing changes.

* add shuyun to powered-by.md (#3341)

* add shuyun to powered-by.md

* update powered-by.md

* Remove static method.

* Add pattern logger to replace the easy logger.
* Doc update
* Support console log 

change `agent.span_limit_per_segment` default value to match the default value of `SPAN_LIMIT_PER_SEGMENT` in https://github.com/apache/skywalking/blob/master/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/conf/Config.java

* improve auto connect

* add config

* use int instread of atomic

* update format

* update doc

* update var name and doc

* fix

* add http

* update plugin

* Add StaticMethodsAroundInterceptor to be injected.

* move to options plugin

* move folder

* update pom

* support https

* add witness class

* Make JDK9-11 available for bootstrap instrumentation

* Remove temp folder of old bootstrap instrumentation requirement.

* remove witness ,work for jdk6,7,8,9,10,11

* Make JDK 12 works.

* move jdk-http-plugin to bootstrap-plugins folder

* add httpsclient

* update README.md

* Support upgrade backend w/o rebooting agents

* Make JDK9-11 available for bootstrap instrumentation

* Remove temp folder of old bootstrap instrumentation requirement.

* Remove javassist dependency

*   Finish the PR.

* Change doc title level.

* Remove the duplicated codes.

* POC: Intercept successfully.

* Refactor codes

* Build the new core

* Setup the new core.

* Push the javassist version to 3.23.2-GA, as it is the last version supports JDK 1.6 compile, according to https://github.com/jboss-javassist/javassist/blob/rel_3_23_2_ga/pom.xml#L149-L160

* Finish the all codes.

* Document updated for bootstrap instrumentation.

* Add a notice to document.

* Remove unexpected file.

* Set javassist version right. Add judge in core interceptors

* Fixe no log bridge implementation

* Fix 3096

* Support bootstrap class enhance and fix OOM by empty stack of exception.

* Agent document update

* Remove a word.

* Fix wrong cause exception search.

* Fix the condition

* Revert bootstrap class loader enhance.

* Remove import.

* no message