Monitor peer review starter checklist

Modify, update, add, edit as seems appropriate

1. If available, monitor design diagram (e.g., statechart) correctly depicts monitor logic
2. Code correctly implements monitor logic
3. Monitor will work even if multiple signals are delivered out-of-order by ROS
4. Monitor will work even if one signal arrives twice between some other signal
5. Invariant violation uses ROS_WARN to issue a violation notice

Last update 12/18/2021