Document groups as the callside way to specify where things go

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Via early filtered logger

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Should definately do this.
Good example:
Some log messages might require responding to by someone who is on-call immedately.
Rather than waiting for someone to check the logs.

So can use:
@warn "External action required to prevent meltdown." group=:notify_oncall

Or using groups to mark a particular type of problem that needs a particular kind of fix.

Memento uses seperate loggers for this.

I think I had most of this discussion with @iamed2 a while back