¹Required dependencies for these components must be first manually downloaded before being built, due to license incompatibilities. For this reason these components are not by default included in the SkyWalking releases.
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¹Required dependencies for these components must be first manually downloaded before being built, due to license incompatibilities. For this reason these components are not by default included in the SkyWalking releases.
²These plugin would probably affect the performance because of enhancing class. Or some of them are in beta, If the above plugins are put under the plugins folder, it will cause the user experience not so good, For this reason these plugins is not load by default.
The Kafka plug-in can't track how applications handle messages
**Reason**:
The Kafka consumer actively takes a message from Kafka Cluster and the agent can not see if the consuming thread is being monitored.
**Resolve**:
Add the `@Trace` annotation to the method of handle message and the method of poll message , see the [document](https://github.com/apache/incubator-skywalking/blob/master/docs/en/Application-toolkit-trace.md)