Event monitoring rules are a great tool with lots of perspectives for future improvements. Here are some aspects teacher would like:
Monitoring is based on absolute numbers of events during a time frame. Messages are send if the number has been reached. A teacher may be interested to get a notification if nobody or only a few of students did an activity. This is mostly a sign for inactivity and a teacher has to be active I.e. Less than 5 students did a quiz during last two days.
Make it easier to define time frames. Add hours and days for defining tresholds. I.e. more than 10 assignment submissions during 1 day.
There are small and huge courses in Moodle systems. The absolute number of events is significant only in relation of the number of students often. Idea: Less than 20 % of students/More than 70% of enrolled students did something during last three days..