Hello, The `FiniteFirehoseFactory` and `InputRowParser` classes were deprecated in 0.17.0 (https://github.com/apache/druid/pull/8823) in favour of `InputSource`. 0.17.0 was released more than 2 years ago in Jan 2020.
I think it is about time that we remove this code entirely. Removing `InputRowParser` may not be as trivial as `EventReceiverFirehoseFactory` depends on it. I didn't find any alternatives for `EventReceiverFirehoseFactory` and it is not marked deprecated as well. But we can still remove `FiniteFirehoseFactory` and the implementations safely as there are alternatives available. Thoughts/Suggestions?
