[GitHub] [pulsar] kuzkdmy opened a new issue, #19729: [Bug] DLQ topic no just-in-time subscription in topic stats subscriptions map

[via GitHub]

kuzkdmy opened a new issue, #19729:
URL: https://github.com/apache/pulsar/issues/19729

   ### Search before asking
   
   - [X] I searched in the [issues](https://github.com/apache/pulsar/issues) 
and found nothing similar.
   
   
   ### Version
   
   2.11.0
   
   ### Minimal reproduce step
   
   Create consumer with deadletter topic support
   ensure call nack so message will comes to dead letter topic
   check dead letter topic exists
   
   ### What did you expect to see?
   
   Subscriptions property not empty
   
   ### What did you see instead?
   
   Subscriptions property empty
   
   ### Anything else?
   
   P.S actually I come to DLQ issue from another one, but I unable to reproduce 
or provide steps how to fix unacked messages, unack functionality just stuck 
sometimes with lost unacked messages when there is high load of processing and 
some temporary issues happens with pulsar, we understood from our internal logs 
that issue is with unack and switch it to DLQ, but now I'm not sure that 
messages will not be lost as subscription don't exists in subscription map 
response(but this is a part of verification from functional test, so may be not 
reproduced on real cluster)
   
   It looks that messages can be deleted from Dead Letter topics no matter is 
it setup in time subscription or not
   
   Consumer setup with dead letter and in time subscription
   <img width="812" alt="image" 
src="https://user-images.githubusercontent.com/15995100/223176454-4e832a23-551a-4411-9e52-8bd9fc6d26a4.png";>
   
   But from pulsar topic stats there is no subscription info
   <img width="1373" alt="image" 
src="https://user-images.githubusercontent.com/15995100/223176295-a6f446d3-3901-4b6d-aeee-2606ff4da114.png";>
   
   
   ### Are you willing to submit a PR?
   
   - [X] I'm willing to submit a PR!


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