Undefined array key in DeduplicationHandler

[markomilivojevic]

Monolog version 3.6.0

Getting:
Undefined array key 1 on line 117 in file /src/Monolog/Handler/DeduplicationHandler.php
Undefined array key 2 on line 117 in file /src/Monolog/Handler/DeduplicationHandler.php

It happens when there are too many errors in the deduplication file (about 1000) and possibly many requests trying to write to the same file.

[Seldaek]

Ok I can see how with concurrent requests it could be that one reads a partially written line perhaps for a new error.. We probably just need to skip invalid lines if it's the last one, and then worst case we'll get duplicate writes. But then we also most likely need to lock the file while writing.