I'm using django-prometheus in multiprocess mode, and I've noticed the time to fetch metrics increases the longer the server has been running. Currently I've got 5414 *.db files in prometheus_multiproc_dir.

MultiProcessCollector.collect reads all db files which I suspect is the bottleneck.

mark_process_dead only removes gauge files.

Do you think it'd be feasible to remove all files by copying the contents of type_{pid}.db files into a single type_old.db file? Or is this something that should be solved in django-prometheus?