The following list of Articles/references on the logmon probe contains extremely helpful information on how to configure and use logmon for log monitoring (includes Basic as well as Advanced).
Overview of Nimsoft logmon (Guide and Examples)
How to configure logmon Watcher for a certain string
How to use variables in logmon
Use logmon to Collect QoS Data
logmon -How to monitor only first/last x lines
logmon probe - maximum length of a line
Clear alarm sent from logmon does not clear the previous alarm
Using Logmon to Capture Output of Netstat Command and Alarm if Port is Not Found
What is the largest logfile that can be monitored by the logmon probe?
How to create logmon Format Rules
How to create custom QOS for variables in logmon