wu-sheng commented on pull request #5002:
URL: https://github.com/apache/skywalking/pull/5002#issuecomment-652451803
This thing is called `span layer`. There is no value for the local span.
```Java
public enum SpanLayer {
DB(1), RPC_FRAMEWORK(2), HTTP(3), MQ(4), CACHE(5);
}
```
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