Changelog of 8.1.0 release. (#5180)

CHANGES.md

@@ -2,6 +2,74 @@ Changes by Version
 ==================
 Release Notes.
 
+8.1.0
+------------------
+#### Project
+* Support Kafka as an optional trace, JVM metrics, profiling snapshots and meter system data transport layer.
+* Support Meter system, including the native metrics APIs and the Spring Sleuth adoption.
+* Support JVM thread metrics.  
+
+#### Java Agent
+* [**Core**] Fix the concurrency access bug in the Concurrency ClassLoader Case. 
+* [**Core**] Separate the config of the plugins from the core level.
+* [**Core**] Support instrumented class cached in memory or file, to be compatible with other agents, such as Arthas.
+* Add logic endpoint concept. Could analysis any span or tags flagged by the logic endpoint.
+* Add Spring annotation component name for UI visualization only.
+* Add support to trace `Call procedures` in MySQL plugin.
+* Support GraphQL plugin.
+* Support Quasar fiber plugin.
+* Support InfluxDB java client plugin.
+* Support brpc java plugin
+* Support `ConsoleAppender` in the logback v1 plugin.
+* Enhance vert.x endpoint names.
+* Optimize the code to prevent mongo statements from being too long.
+* Fix WebFlux plugin concurrency access bug.
+* Fix ShardingSphere plugins internal conflicts.
+* Fix duplicated Spring MVC endpoint.
+* Fix lettuce plugin sometimes trace doesn‘t show span layer. 
+* Fix `@Tag` returnedObject bug.
+
+#### OAP-Backend
+* Support Jetty Server advanced configurations.
+* Support label based filter in the prometheus fetcher and OpenCensus receiver.
+* Support using k8s configmap as the configuration center.
+* Support OAP health check, and storage module health check.
+* Support sampling rate in the dynamic configuration.
+* Add `endpoint_relation_sla` and `endpoint_relation_percentile` for endpoint relationship metrics.
+* Add components for Python plugins, including Kafka, Tornado, Redis, Django, PyMysql.
+* Add components for Golang SDK.
+* Add Nacos 1.3.1 back as an optional cluster coordinator and dynamic configuration center.
+* Enhance the metrics query for ElasticSearch implementation to increase the stability.
+* Reduce the length of storage entity names in the self-observability for MySQL and TiDB storage.
+* Fix labels are missing in Prometheus analysis context.
+* Fix column length issue in MySQL/TiDB storage.
+* Fix no data in 2nd level aggregation in self-observability. 
+* Fix searchService bug in ES implementation.
+* Fix wrong validation of endpoint relation entity query.
+* Fix the bug caused by the OAL debug flag.
+* Fix endpoint dependency bug in MQ and uninstrumented proxy cases.
+* Fix time bucket conversion issue in the InfluxDB storage implementation.
+* Update k8s client to 8.0.0
+
+#### UI
+* Support endpoint dependency graph.
+* Support x-scroll of trace/profile page
+* Fix database selector issue.
+* Add the bar chart in the UI templates.
+
+#### Document
+* Update the user logo wall.
+* Add backend configuration vocabulary document.
+* Add agent installation doc for Tomcat9 on Windows.
+* Add istioctl ALS commands for the document.
+* Fix TTL documentation.
+* Add FAQ doc about thread instrumentation.
+
+#### CVE
+* Fix fuzzy query sql injection in the MySQL/TiDB storage. 
+
+All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/52?closed=1)
+
 8.0.1
 ------------------
 

docs/en/FAQ/why_mq_not_involved.md

@@ -22,5 +22,9 @@ we could consider adding a better dynamic trace sampling mechanism at the backen
 when throughput goes over the threshold, active the sampling rate to 100%->10% step by step, 
 which means you could get the OAP and ES 3 times more powerful than usual, just ignore the traces at hot time.
 
+### Is MQ transport acceptable even there are several side effects?
+Even MQ transport is not recommended from the production perspective, SkyWalking still has optional plugins named
+`kafka-reporter` and `kafka-fetcher` for this feature since 8.1.0. 
+
 ### How about MQ metrics data exporter?
 I would say, it is already available there. Exporter module with gRPC default mechanism is there. It is easy to provide a new implementor of that module.
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