Issue warning when queue gets too full

[abrahammurciano]

Ideas/To do

• [x] Add parameter queue_warning_size (default 100?)
• [x] Replace Queue with a priority queue
• [x] Issue queue size warnings with higher priority
• [x] Make sure queue size warning is not issued too frequently
  • [ ] Maybe only once
  • [x] Maybe once per queue fill up (e.g. once it gets full and a warning is issued, it won't be issued again until queue is half empty then fills up again)
  • bool issue_warning (init True) set to false after warning is issued and set to true when dequeueing and qsize() < queue_warning_size/2
  • when emitting, if qsize() > queue_warning_size and issue_warning, then enqueue log record with higher priority and set issue_warning to False