Parameter and Command Reference > Logging Configuration Parameters > LogLevel 

LogLevel 
The type of messages that are logged. Type one of the following to determine the type of messages that are logged:
 
The log levels are hierarchical from least logging to most logging. You can use the LogLevelMatch parameter to specify which messages are reported relative to the specified LogLevel. For example, if LogLevelMatch=LessThan and LogLevel=Warning, "Normal" and "Full" message types are reported.
Use the LogOutputLogLevel parameter to report the log level in the log.
 
Logging and/or LogStream
If you set this parameter in the Logging and LogStream sections, the setting in the LogStream section takes precedence for the specified log stream.
LogLevel=Warning