Logging

Level	When to use	Example	Alert	Response	Environments
Fatal	The system can't run	Can't connect to main DB	Immediately	Immediately address	All
Error	There is a system problem	Unable to run a DB query	If the count passes a small threshold	Keep current on all errors with plan for addressing and escalate as appropriate	All
Warning	There is a problem that isn't a system problem	A specific request took longer than expected to process	If the count passes a big threshold	Generally stay current with most common logs and optionally create plan and/or escalate as appropriate	All
Info	Something happened that isn't a problem but is noteworthy	Unable to process request because the request was invalid	Optionally if the count passes a huge threshold	Occasionally review to look for patterns that may need to be addressed	Probably prod. Usually test. Always Dev.
Debug	Something not noteworthy but useful for inspecting how the system is running	A specific query took x milliseconds to run	Never	None	Prod only rarely for some loggers. test rarely. Dev often.