wankai123 commented on PR #13608:
URL: https://github.com/apache/skywalking/pull/13608#issuecomment-3650915014

   
https://github.com/apache/skywalking/blob/ed5e729026da621557b83b5dfa78e57ee0bc524a/oap-server/analyzer/meter-analyzer/src/main/java/org/apache/skywalking/oap/meter/analyzer/dsl/SampleFamily.java#L403
   
   The filter function return a `EMPTY` SampleFamily if no matched metrics. 
That's why BanyanDB rules will process these metrics. I think skip the process 
if the input `ALL EMPTY` after filter is good. @wu-sheng 


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