Potential subtasks: - [x] #2890 - [x] #2826 - [x] #2839 - [x] #2840 - [x] #2891 - [x] #2892
Potential subtasks:
NOTES.rstandCHANGELOG.md#2890AbstractChecker.run()in nav/statemon/abstractchecker.py to newer Python #2839