- Critical / Fatal: Unrecoverable without human intervention, someone needs to get out of bed, now.
- Error : Recoverable without human intervention, but not without data / state loss. Must be fixed asap. An assumption didn't hold.
- Warning: Recoverable without intervention. Must have an issue created and prioritised. ( If business as usual, this could be downgrading to INFO. )
The main difference therefore between error and warning is, "We didn't think this could happen" vs "We thought this might happen".
So for example, a failure to parse JSON might be an error if you're responsible for generating that serialisation, but might be a warning if you're not.
So for example, a failure to parse JSON might be an error if you're responsible for generating that serialisation, but might be a warning if you're not.