Per file log levels

[rustyrussell]

This has been long outstanding request (#5392), and rather than push it back another milestone (again!) I've implemented it. Cleaned some things up too.

[grubles]

I can't seem to create separate INFO and DEBUG logs.

log-file=/path/to/debug.log
log-level=debug:/path/to/debug.log

log-file=/path/to/info.log
log-level=info:/path/to/info.log

CLN will create both files but only log INFO messages to both. Do I need something like log-file2 / log-level2 for the second log?

[rustyrussell]

I can't seem to create separate INFO and DEBUG logs.

log-file=/path/to/debug.log
log-level=debug:/path/to/debug.log

You want two :: here, the second is the prefix-matching pattern. Since the default is info, you're only getting info messages here, since no prefixes match the pattern.

log-file=/path/to/info.log
log-level=info:/path/to/info.log

CLN will create both files but only log INFO messages to both. Do I need something like `log-file2` / `log-level2` for the second log?

You probably want:

# Anything >= info goes here.
log-level=info::/path/to/info.log
# Anything >= debug goes here.
log-level=info::/path/to/debug.log

[grubles]

That did the trick, @rustyrussell. I now have an info.log with INFO messages only, and a DEBUG log (debug.log) where the firehose is enabled.