Changes by Version
==================
Release Notes.

8.8.0
------------------

#### Project

* Split javaagent into skywalking-java repository. https://github.com/apache/skywalking-java

#### OAP Server

* Fix CVE-2021-35515, CVE-2021-35516, CVE-2021-35517, CVE-2021-36090. Upgrade org.apache.commons:commons-compress to
  1.21.
* kubernetes java client upgrade from 12.0.1 to 13.0.0
* Add `event` http receiver
* Support Metric level function `serviceRelation` in `MAL`.
* Support envoy metrics binding into the topology.
* Fix openapi-definitions folder not being read correctly.
* Trace segment wouldn't be recognized as a TopN sample service. Add through #4694 experimentally, but it caused
  performance impact.
* Remove `version` and `endTime` in the segment entity. Reduce indexing payload.
* Fix `mapper_parsing_exception` in ElasticSearch 7.14.
* Support component IDs for Go-Kratos framework.
* [Break Change] Remove endpoint name in the trace query condition. Only support `query by endpoint id`.
* Fix `ProfileSnapshotExporterTest` case on `OpenJDK Runtime Environment AdoptOpenJDK-11.0.11+9 (build 11.0.11+9)`,
  MacOS.
* [Break Change] Remove page path in the browser log query condition. Only support `query by page path id`.
* [Break Change] Remove endpoint name in the backend log query condition. Only support `query by endpoint id`.
* [Break Change] Fix typo for a column `page_path_id`(was `pate_path_id`) of storage entity `browser_error_log`.
* Add component id for Python falcon plugin.
* Add `rpcStatusCode` for `rpc.status_code` tag. The `responseCode` field is marked as deprecated and replaced by `httpResponseStatusCode` field. 
* Remove the duplicated tags to reduce the storage payload.
* Add a new API to test log analysis language.
* Harden the security of Groovy-based DSL, MAL and LAL.
* Fix distinct in Service/Instance/Endpoint query is not working.
* Support collection type in dynamic configuration core.
* Support zookeeper grouped dynamic configurations.
* Fix NPE when OAP nodes synchronize events with each other in cluster mode.
* Support k8s configmap grouped dynamic configurations.
* Add desc sort function in H2 and ElasticSearch implementations of IBrowserLogQueryDAO
* Support configure sampling policy by `configuration module` dynamically and static configuration
  file `trace-sampling-policy-settings.yml` for service dimension on the backend side. Dynamic
  configurations `agent-analyzer.default.sampleRate` and `agent-analyzer.default.slowTraceSegmentThreshold` are replaced
  by `agent-analyzer.default.traceSamplingPolicy`. Static configurations `agent-analyzer.default.sampleRate`
  and `agent-analyzer.default.slowTraceSegmentThreshold` are replaced
  by `agent-analyzer.default.traceSamplingPolicySettingsFile`.
* Fix dynamic configuration watch implementation current value not null when the config is deleted.
* Fix `LoggingConfigWatcher` return `watch.value` would not consistent with the real configuration content.
* Fix `ZookeeperConfigWatcherRegister.readConfig()` could cause `NPE` when `data.getData()` is null.
* Support nacos grouped dynamic configurations.
* Support for filter function filtering of int type values.
* Support mTLS for gRPC channel.
* Add yaml file suffix limit when reading ui templates.
* Support consul grouped dynamic configurations.
* Fix `H2MetadataQueryDAO.searchService` doesn't support auto grouping.
* Rebuilt ElasticSearch client on top of their REST API.
* Fix ElasticSearch storage plugin doesn't work when hot reloading from `secretsManagementFile`.

#### UI

* Fix not found error when refresh UI.
* Update endpointName to endpointId in the query trace condition.
* Add Python falcon icon on the UI.
* Fix searching endpoints with keywords.
* Support clicking the service name in the chart to link to the trace or log page.
* Implement the Log Analysis Language text regexp debugger.

#### Documentation

* Add a section in `Log Collecting And Analysis` doc, introducing the new Python agent log reporter.
* Add one missing step in `otel-receiver` doc about how to activate the default receiver.
* Reorganize dynamic configuration doc.
* Add more description about meter configurations in `backend-meter` doc.

All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/96?closed=1)

------------------
Find change logs of all versions [here](changes).