Specifying log levels The log level determines which type of messages to include in the platform log and application log. The log level spans from 0 to 4 – the higher the number, the more details are added to the log. Level Types of messages included in log 0 Severe errors only. 1 As level 0 plus all other types of errors. 2 As level 1 plus warnings. 3 As level 2 plus information messages. 4 As level 3 plus extended information messages.