Dariusz Jędrzejczyk

Thanks for doing that @markrichardstm That clears up way for further investigation :) I believe there is merit in what @ttddyy noticed. The use of `publishOn` in combination with `subscribeOn`...

And in the code that uses `fromExecutorService` if you instead use `Schedulers.boundedElastic` just for the sake of it, do you run into the issue? For the `Mono.fromCompletionStage` - it should...

@markrichardstm I had a look at the project you provided and have some observations (wink, wink). First, I had a suspicion that the problem is the `observe` method: ```java public...

@rethab did the issue start appearing after an upgrade to Boot 3.3.2 ? Were you running the service in an earlier version and have not observed any leaks?

Hey, thanks for the report. It has not been noticed for quite a while, so I do apologize on behalf of the team. I will keep it in the backlog...

@alexeykurshakov these cancellations have reasonable explanations. A couple examples: - `Mono.from(Publisher).subscribe()` cancels the `Publisher` once the first item is emitted, as `Mono` expects at most item to be emitted to...

@Dambldore is this anyhow connected to the comment in https://github.com/reactor/reactor-core/issues/3541#issuecomment-2306413005 ?

@Dambldore thanks. I see. I am not sure whether this is the right repository to report this. From the logs you provided, the only hints of reactor.core are reactor.core.publisher.BaseSubscriber reactor.core.publisher.FluxMap$MapSubscriber...

Let's hold with merging until https://github.com/micrometer-metrics/micrometer/issues/5388 is resolved.

There's a fix in M3 which we can incorporate once it's released.