If there is no log file, then the message is written to the correlator's standard output stream stdout.
The expression that you log must be of type
string. The value is written only if the current logging level in effect is a priority equal to or higher than the log level specified in the
log statement, with the exception of
OFF. If you do not specify a level,
INFO is used. At a log level equal to
OFF, only logs explicitly set to this level are written. For details, see
Logging and printing.