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Log 'msg % args' at level 'level' once per 'n' times.

Logs the 1st call, (N+1)st call, (2N+1)st call, etc. Not threadsafe.

level The level at which to log.
msg The message to be logged.
n The number of times this should be called before it is logged.
*args The args to be substituted into the msg.