3rd party threads

[Sergei Egorov]

We should support checking threads originated from the 3rd party reactive libraries (RxJava, Cassandra, etc).

Some thoughts:

• the easiest option would be to check their names, although it is not 100% reliable.
• there might be something on the stacktrace to determine whenever the operation can be blocking or not

[Oleh Dokuka]

Is that simpler to mandate users to impl NonBlocking interface to track their thread as non blicking

[Sergei Egorov]

@OlegDokuka only works when the thread is started by Reactor ecosystem. But if we have something like Flux.from(rxJavaObservable) then processing will run on RxJava's thread and we will not be able to detect it (unless we do something special for it)

[Sergei Egorov]

After #2, we got another option. Something like:

BlockHound.builder()
    .blockingThreadPredicate(thread -> ...)
    .install();