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Allow users with special "logtrace" priv to watch traces of server logs,
useful for admin or debugging purposes.

Use the /logtrace command to get/set the logging level.  The special
"all" and "none" levels capture all and none, respectively, while the
other levels capture each different minetest standard logging level and
anything higher.  If a message cannot be classified (it doesn't have a
valid logging level) then it will only be in the "all" feed.

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