* Update elasticsearch client 7.0.0 to elasticsearch client 7.5.0.
* Update CHANGES.md and LICENSE.

The current implementation of envoy ALS K8S analysis is based on the hierarchy, pod -> StatefulSet -> deployment, StatefulSet, or others. It's freaky and different from the Istio Kubernetes registry.

The new path is pod -> endpoint -> service, and we should leverage Informer API instead of raw Kubernetes API.

* Upgrade dependencies and make the JDK11 compiling passed.

* Update license and fix license check file.

* Add CI for JDK11 compiling.

* Update doc.

* Support SSL for prometheus telemetry and prometheus fetcher
* Documents
* Clear up abandunt dependencies
* Update license
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Add annotation(AlarmCore.start)

* Upgrade nacos version to 1.2.0

* Revert "Upgrade nacos version to 1.2.0"

This reverts commit 4d7b06f6d20ee09ad377ad6ef736aeab429314e0.

* Update nacos version to 1.2.0(Solve the security problem of the old version of fastsjon)

* Recovery annotation

* Recovery annotation

* Update nacos version to 1.2.0

* Update tls_key_generate.sh path

Update tls_key_generate.sh path

* Add annotation(AlarmCore.start)

* Revert "Upgrade nacos version to 1.2.0"

This reverts commit 4d7b06f6d20ee09ad377ad6ef736aeab429314e0.

* Update nacos version to 1.2.0(Solve the security problem of the old version of fastsjon)

* Recovery annotation

* Recovery annotation

* Update tls_key_generate.sh path

* Execution Authority

* Remove nacos

* remove nacos code

* remove nacos

remove nacos

* remove nacos

remove nacos

* remove nacos

* remove nacos
Co-authored-by: Nsongzhendong <289505773@qq.com>
Co-authored-by: Nsongzhendong <songzhendong@xiaomi.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

[CVE] Update Nacos 1.0.0 to Nacos 1.2.0(Solve the security problem of the old version of fastjson) (#4753)

* Update nacos version to 1.2.0(Solve the security problem of the old version of fastsjon)
Co-authored-by: Nsongzhendong <289505773@qq.com>
Co-authored-by: Nsongzhendong <songzhendong@xiaomi.com>

* Enable OAP gRPC SSL transportation

Porting to OpenSSL to enable SSL transportation. The server private
key is in the format of PCKS#8, certificates is x509 though.
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Add netty-tcnative-boringssl-static 2.0.26 licnese
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Update docs/en/setup/backend/grpc-ssl.md
Co-Authored-By: Nkezhenxu94 <kezhenxu94@apache.org>

* Update docs/en/setup/backend/grpc-ssl.md
Co-Authored-By: Nkezhenxu94 <kezhenxu94@apache.org>

* Add SSL to grpc remote client and sharing server
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Update documents
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Fix nits
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Fix test case
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Add e2e-ssl and remove other test cases temporarily
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Add TLS relevant files
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Decrease timeout
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Test config works
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* triger CI on oap-ssl branch

* Disable agent ca
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Switch to sharing server
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Add agent log to console
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Upload log files

* Change backend
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Revert "Change backend"

This reverts commit 7a085711e3653d3bf642aa84f73650e22595e383.

* Update backend
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Revert e2e
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Ignore TSL relevant files
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Polish codes
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Update certificates expires year to 2120
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>
Co-authored-by: Nkezhenxu94 <kezhenxu94@apache.org>

* provide influxdb as a new storage plugin
Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* Sync UI.

* Remove elementui LICENSE

* 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>

* Update: add LICENSE-material-design

* [Feature] Officially support ElasticSearch 7 as backend storage

* Extract bootstrap module to be shared by multiple starters

* Add missing configuration file and distinguish different version in test

* Update known-oap-backend-dependencies-es7.txt

Update the dependency lib

* Fix missing adaptation to ElasticSearch 7

* Rename ElasticSearch 7 specific class with Es7 infix

* Fix miss-adapted ElasticSearch DAO API

* Add ES7 specific configuration and polish documentations

* Polish documentations

* Polish documentations

* Update joda lib to fix UTC 13/14 bug

* Change the dependencies file.

* Upgrade guava version to support higher JDK version

* Adjust license version

* Update doc

* Add dependency licenses check 

* Support etcd configuration.

* Change OAL generator tool to runtime.

Step 1. change project structure. API links and maven pom.

* Part of metrics class generation

* Metrcis class generated.

* Set up the basic structure of new OAL engine.

* Finish metrics generation.

* Support dispatcher generation.

* Format codes.

* Generate dispatcher all methods.

* Implement disable in hardcode.

* Clear up

* Fix compile startup.

* Update license and document of new OAL engine.

* Fix rat.

* Disable class output in default

* Copy from @kezhenxu94 's test PR, https://github.com/apache/skywalking/pull/3110

* Wait for the mount command to finish

* Add cluster-etcd-plugin

* Provide Apollo dynamic configuration center implementation. fixes #2825

* Fix #2546

* Change the stackdepth type

* Fix bug

* Fix CI failed

* fix #2599

* fix ci

* add license

* add ActiveTag error methods

* fix

* fix

* nacos

* nacos

* nacos

* nacos

* fix ci

* support nacos cluster

* fix yml

* fix license

* fix ci

* remove optional

* update license

* update license and doc

* fix

* 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.

* Add envoy metrics service protos

This patch imports protos from envoyproxy/data-plane-api and
prometheus/client_model to enable metrics service service feature in
SkyWalking OAP.
Signed-off-by: NDhi Aurrahman <dio@tetrate.io>

* Add Envoy related docs
Signed-off-by: NDhi Aurrahman <dio@tetrate.io>

* Update the LICENSE to include new protos license

From:
- envoyproxy/data-plane-api
- prometheus/client_model
Signed-off-by: NDhi Aurrahman <dio@tetrate.io>

* Add a complete config.yaml example
Signed-off-by: NDhi Aurrahman <dio@tetrate.io>

* Add note on Envoy dynamic config
Signed-off-by: NDhi Aurrahman <dio@tetrate.io>

* Add protoc-gen-validate license
Signed-off-by: NDhi Aurrahman <dio@tetrate.io>

* Add samples
Signed-off-by: NDhi Aurrahman <dio@tetrate.io>

* Make CI and license right.

* Update README.md

@dhi typo :P

* Update README.md

Another typo :P

* Delete metrics.json

metrics.json is included in identify.json and not be linked in document.

* Finish the APIs of telemetry module.

* Add prometheus license.

* Active default telemetry provider.