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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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