Add 8.6.0 changelog

changes/changes-8.6.0.md

+Changes by Version
+==================
+Release Notes.
+
+8.6.0
+------------------
+#### Project
+* Add OpenSearch as storage option.
+* Upgrade Kubernetes Java client dependency to 11.0.
+* Fix plugin test script error in macOS.
+
+#### Java Agent
+* Add `trace_segment_ref_limit_per_span` configuration mechanism to avoid OOM.
+* Improve `GlobalIdGenerator` performance.
+* Add an agent plugin to support elasticsearch7.
+* Add `jsonrpc4j` agent plugin.
+* new options to support multi skywalking cluster use same kafka cluster(plugin.kafka.namespace)
+* resolve agent has no retries if connect kafka cluster failed when bootstrap
+* Add Seata in the component definition. Seata plugin hosts on Seata project.
+* Extended Kafka plugin to properly trace consumers that have topic partitions directly assigned.
+* Support Kafka consumer 2.8.0.
+* Support print SkyWalking context to logs.
+* Add `MessageListener` enhancement in pulsar plugin.
+* fix a bug that spring-mvc set an error endpoint name if the controller class annotation implements an interface.
+* Add an optional agent plugin to support mybatis.
+* Add `spring-cloud-gateway-3.x` optional plugin.
+* Add `okhttp-4.x` plugin.
+* Fix NPE when thrift field is nested in plugin `thrift`
+* Fix possible NullPointerException in agent's ES plugin.
+* Fix the conversion problem of float type in ConfigInitializer.
+* Fixed part of the dynamic configuration of ConfigurationDiscoveryService that does not take effect under certain circumstances.
+* Introduce method interceptor API v2
+* Fix ClassCast issue for RequestHolder/ResponseHolder.
+* fixed `jdk-threading-plugin` memory leak.
+* Optimize multiple field reflection operation in Feign plugin.
+* Fix `trace-ignore-plugin` TraceIgnorePathPatterns can't set empty value
+
+#### OAP-Backend
+* BugFix: filter invalid Envoy access logs whose socket address is empty.
+* Fix K8s monitoring the incorrect metrics calculate. 
+* Loop alarm into event system.
+* Support alarm tags.
+* Support WeLink as a channel of alarm notification.
+* Fix: Some defensive codes didn't work in `PercentileFunction combine`.
+* CVE: fix Jetty vulnerability. https://nvd.nist.gov/vuln/detail/CVE-2019-17638
+* Fix: MAL function would miss samples name after creating new samples.
+* perf: use iterator.remove() to remove modulesWithoutProvider
+* Support analyzing Envoy TCP access logs and persist error TCP logs.
+* Fix: Envoy error logs are not persisted when no metrics are generated
+* Fix: Memory leakage of low version etcd client. [fix-issue](https://github.com/jurmous/etcd4j/pull/185)
+* Allow multiple definitions as fallback in metadata-service-mapping.yaml file and `k8sServiceNameRule`.
+* Fix: NPE when configmap has no data.
+* Fix: Dynamic Configuration key `slowTraceSegmentThreshold` not work
+* Fix: `!=` is not supported in oal when parameters are numbers.
+* Include events of the entity(s) in the alarm.
+* Support `native-json` format log in kafka-fetcher-plugin.
+* Fix counter misuse in the alarm core. Alarm can't be triggered in time.
+* Events can be configured as alarm source.
+* Make the number of core worker in meter converter thread pool configurable.
+* Add HTTP implementation of logs reporting protocol.
+* Make metrics exporter still work even when storage layer failed.
+* Fix Jetty HTTP `TRACE` issue, disable HTTP methods except `POST`.
+* CVE: upgrade snakeyaml to prevent [billion laughs attack](https://en.wikipedia.org/wiki/Billion_laughs#Variations) in dynamic configuration.
+* polish debug logging avoids null value when the segment ignored.
+
+#### UI
+* Add logo for kong plugin.
+* Add apisix logo.
+* Refactor js to ts for browser logs and style change.
+* When creating service groups in the topology, it is better if the service names are sorted.
+* Add tooltip for dashboard component.
+* Fix style of endpoint dependency.
+* Support search and visualize alarms with tags.
+* Fix configurations on dashboard.
+* Support to configure the maximum number of displayed items.
+* After changing the durationTime, the topology shows the originally selected group or service.
+* remove the no use maxItemNum for labeled-value metric, etc.
+* Add Azure Functions logo.
+* Support search Endpoint use keyword params in trace view.
+* Add a function which show the statistics infomation during the trace query.
+* Remove the sort button at the column of Type in the trace statistics page.
+* Optimize the APISIX icon in the topology.
+* Implement metrics templates in the topology.
+* Visualize Events on the alarm page.
+* Update duration steps in graphs for Trace and Log.
+
+#### Documentation
+* Polish k8s monitoring otel-collector configuration example.
+* Print SkyWalking context to logs configuration example.
+* Update doc about metrics v2 APIs.
+
+All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/84?closed=1)
+
+------------------
+Find change logs of all versions [here](changes).