GitHub user numinnex edited a comment on the discussion: Adding a possibility 
to notify consumers

Yeah `poll_messages` /w timeout can definitely solve this problem (atleast 
partially), but the point I tried to make is that notifications could be used 
for different purposes, for example notifying when consumer/consumers fall 
really far behind and build massive backlog (this could be reacted by the user 
of the SDK, by creating additional consumers). 

I proposed to make it in an extensible way, because there would be more 
use-cases like this and we wouldn't be able to cover all of those on our own. 

Also I kinda feel like your solution doesn't necessary solve the problem at 
hand, because what they user wanted was a notification, not long polling, this 
gives the user of the SDK higher degree of freedom as what they want to do with 
it (in most cases it would be using `poll_messages` API). 

GitHub link: 
https://github.com/apache/iggy/discussions/2854#discussioncomment-16311952

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