When to log as error and warning

[j4m1ef0rd]

Not sure if this is documented anywhere, but what qualifies a log to be an error instead of a warning?
For example:

[WARN] E5 chainflip_engine::multisig::client::ceremony_manager - Keygen ceremony failed: Insufficient messages received in broadcast of initial commitments

This log is only a warning, but it is a pretty serious failure.

After a quick discussion with @msgmaxim, we came to the conclusion that the log should only be error if:

• The user needs to know about it or
• Chainflip would like to know about it (to be reported by the user)

So by that definition, the above log message is correctly implemented as a warning because there is probably nothing the user can do about it.

There was once talk of @AlastairHolmes creating a logging document, maybe this document standardize the use of logging levels?

[dandanlen]

A quick google search turned up this: