* disable kafka plugin

* enable docker file of kafka for e2e test

* Set the endpoint name length to 150, to keep safe and avoid over-length.

* Set endpointNameMaxLength in the application.yml

* Fix a mischange.

* Correct the endpoint name length control logic
Co-authored-by: Nkezhenxu94 <kezhenxu94@apache.org>

* 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>

* 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

Negative or zero means off, by default

* Log harmless exception in DEBUG level

* Log harmless exception in DEBUG level

* Minor refactor to avoid default method

* Add Java agent plugin for Jdk Threading

* Fix expected data according to changes in master

* Update agent.config

* Fix failed plugin test

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

* 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

* Add more configuration and explainations.

* 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.

* Revert reset feature.

* Set default dist alarm settings and make dist package setting files right.

* Support empty list.

* Manually trigger agent registration and write registration status to file

* Delete unused variables

* Code optimization, encapsulating some methods

* add clear DataCarrier function

* revert SkyWalkingAgent

* Optimize code and logic, including updating applicatin_id in unRegisterOperationNames

* Server end metadata loss notification

* Server end metadata loss notification

* fix file stream close and other problem

* revert to old

* fix some bug
Signed-off-by: NLiu-XinYuan <879928098@qq.com>

* fix some bugs in agent reset

* add close inputStream and fileChannel and fix some bug

* fixed some bugs

Remove collector.servers and collector.direct_servers, and add collector.backend_service setting. cc @ascrutae

* Provide document for TLS

* Provide direct uplink doc.

* Add namespace document.

* Provide token auth doc.

* Provide setting override document.

* Fix two typo.

* Fix more typos.

* Add client side token.

* Fix ci.

* Fix most codes of token auth at both sides.

* Add settings in config files.

* Make auth interceptor doesn't throw expcetion.

* Update AuthenticationSimpleChecker.java

* Update AuthenticationActivator.java

* Revert "Update AuthenticationActivator.java"

This reverts commit 0935f18fd6802ab84c12e0609c21ef753ff51be3.

* Merge branch 'feature/token-auth' of https://github.com/apache/incubator-skywalking into feature/token-auth

# Conflicts:
#	apm-collector/apm-collector-agent/agent-grpc/agent-grpc-provider/src/main/java/org/apache/skywalking/apm/collector/agent/grpc/provider/AuthenticationSimpleChecker.java

* Fix Auhentication token works incorrect (#1001)

* Fix Auhentication token works incorrect

* Change way to build GRPC Channel

* Response an empty header when auth fails.

Fix IPMC checks for releasing.

* Support direct server setting in agent.

* Fix format.

* Add direct_servers check (#981)