[bluGill]

Warnings are for where you expect someplace else to know/log if it really is an error but it might also be normal. You might log why a file io operation failed: if the caller recovers somehow it isn't an errer, but if they can't they log an error and when investigating the warning gives the detail you need to figure it out.

[kgklxksnrb]

Who proactively investigates warnings?

[bluGill]

statistacs are someimes run and the most common investigated (normally shut up the noise)

mostly though when you are on a known problem warnings should be a useful filter to find where in the logs the problem might have started, then you use that timestamp to find info logs in the same area