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Posted to commits@pulsar.apache.org by GitBox <gi...@apache.org> on 2020/11/16 08:47:02 UTC

[GitHub] [pulsar] codelipenghui commented on issue #8573: Export Prometheus metric for the number of messages that topic subscription skip through the TTL

codelipenghui commented on issue #8573:
URL: https://github.com/apache/pulsar/issues/8573#issuecomment-727830521


   Thanks, @xuesongxs made this feature request. I also met some users who want to know how many messages are expired at what time? Currently, these metrics are too few, so that TTL looks like a black box, unobservable. 
   
   I think we can do the following things to improve the observability.
   
   1. Expose the last TTL task execute timestamp
   2. Recore the total expired message
   
   Furthermore, I think it's better to support write the expired messages to a specific topic so that users can get all expired messages. Or a server-side plugin to receive the message expired listener.


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