skywalking-java/changes/changes-9.4.0.md

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Changes by Version
==================
Release Notes.
9.4.0
------------------
* Upgrade nats plugin to support 2.16.5
* Add agent self-observability.
* Fix intermittent ClassCircularityError by preloading ThreadLocalRandom since ByteBuddy 1.12.11
* Add witness class/method for resteasy-server plugin(v3/v4/v6)
* Add async-profiler feature for performance analysis. This requires OAP server 10.2.0
* Support db.instance tag,db.collection tag and AggregateOperation span for mongodb plugin(3.x/4.x)
* Improve CustomizeConfiguration by avoiding repeatedly resolve file config
* Add empty judgment for constructorInterceptPoint
* Bump up gRPC to 1.68.1
* Bump up netty to 4.1.115.Final
* Fix the `CreateAopProxyInterceptor` in the Spring core-patch to prevent it from changing the implementation of the
Spring AOP proxy
* Support Tracing for GlobalFilter and GatewayFilter in Spring Gateway
* [doc] Enhance Custom Trace Ignoring Plugin document about conflicts with the plugin of **sampler plugin with CPU
policy**
* [doc] Add Spring Gateway Plugin document
* [doc] Add 4 menu items guiding users to find important notices for Spring Annotation Plugin, Custom Trace Ignoring
Plugin, Kotlin Coroutine Plugin, and Spring Gateway Plugin
* Change context and parent entry span propagation mechanism from gRPC ThreadLocal context to SkyWalking native dynamic
field as new propagation mechanism, to better support async scenarios.
* Add Caffeine plugin as optional.
* Add Undertow 2.1.7.final+ worker thread pool metrics.
* Support for tracking in spring gateway versions 4.1.2 and above.
* Fix `ConsumeDriver` running status concurrency issues.
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/222?closed=1)