Signed-off-by: NHongtao Gao <hanahmily@gmail.com>

Add  arg `namespace` to func `retagByK8sMeta`, rebuild the relationship between pod and service by labels (#6650)

* Add `namespace` to func `retagByK8sMeta`, rebuild the relationship between pod and service by labels

* add param check

Add function `retagByK8sMeta` and opt type `K8sRetagType.Pod2Service` in MAL for k8s to relate pods and services. (#6608)

Support metrics grouped by scope labelValue in MAL, no need global same labelValue as before. (#6495)

* Add `sum` function in meter system

* Fix minor potential bug and reformat some codes

* Fix a bug

* Use Set to hold the {aggregate,scope} labels as same labels maybe added by multiple aggregation functions

* Separate downsampling function and revert unnecessary codes

Happy Chinese New Year !!

Support multiple implementations of StorageBuilder in different storage implementations - stage 2 (#6336)

* [maven-release-plugin] prepare release v8.4.0

* [maven-release-plugin] prepare for next development iteration

Fix bug that the same sample name in one MAL expression caused `IllegalArgumentException` in `Analyzer.analyse`. (#6250)

* Filter expression based on input samples
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

* Fix MAL concurrent issues
Signed-off-by: NGao Hongtao <hanahmily@gmail.com>
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* [maven-release-plugin] prepare release v8.3.0

* [maven-release-plugin] prepare for next development iteration

* Add Istio control plane otel MAL expressions and UI template
* Remove OpenCensus receiver, add OpenTelemetry receiver
* Transfer oc receiver to ot receiver
* Create indices on boot
* Document istio metrics and otel receiver
* Update CHANGES.md
* Fix potential NPE
* Add group to meter and cleanup istio mixer
* Update e2e case due to the change of meter metric name
* Update prometheus fetcher config, fix sql builder issue of h2
* Disable istio and so11y metrics by default.
* Fix micrometer testcase

* Polish the context and optimize the tag analyze

* Fix bug of new context codes.

* add oal excludes and includes to support tags
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>

* [maven-release-plugin] prepare release v8.2.0

* [maven-release-plugin] prepare for next development iteration

* Add SW_NO_UPSTREAM_REAL_ADDRESS config doc

* Fix legal config issue.

* Update docs/en/setup/backend/configuration-vocabulary.md

* Add a test case to verify the module config initializer, which only supports 4 simple types.
Co-authored-by: Nkezhenxu94 <kezhenxu94@apache.org>

* Upgrade dependencies and make the JDK11 compiling passed.

* Update license and fix license check file.

* Add CI for JDK11 compiling.

* Update doc.