Sets the logging verbosity level for a specified duration.
The libprocess library uses glog for logging. The library only uses verbose logging which means nothing will be output unless the verbosity level is set (by default it's 0, libprocess uses levels 1, 2, and 3).
NOTE: If your application uses glog this will also affect your verbose logging.
level=VALUE Verbosity level (e.g., 1, 2, 3) duration=VALUE Duration to keep verbosity level toggled (e.g., 10secs, 15mins, etc.)
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