If I place a computer in maintenance mode and several monitors go unhealthy, when I exit maintenance mode would an alert be created or would I have to wait for the monitor to go healthy again (in which case I'd get a closed email notification) and than return to unhealthy state. Or would it generate an alert as soon as the the samples were taken based on the frequency and threshold? I'm guessing once exiting maintenance mode the sample collection is restarted thus if I require three samples each after 5 minute interval and all over 80% threshold I'd have to wait at least 15 minutes after exiting maintenance mode again or will it include samples taken prior to entering maintenance mode?

Typically monitors detect the recent state and raise an alert (if enabled) as soon as it exits MM. If there is a sync time configured, the monitor will take care of it.

Sample:

Sync time 01:00, intervall 15min -> monitor will run every quarter of an hour.

Sync time 03:30, intervall 24h -> monitor will run at 03:30.

Further, there are some special modules available, but basically that's it.

Cheers,
Patrick

when agent comes out of MM , it will calculate each monitor's health and will generate an alert if the alerting condition is met. 

The Rules, Monitors etc will be stopped and will not occur when MM is turned on in an Agent.

When you manually stop it or it stops as pert the scheduled end time, Then the Alerts, Rules are captured post completion of the  maintenance mode end time.

So you will not get any state change alerts for the period when the maintenance mode is present in an agent.

When you existing maintenance mode, SCOM will recalculate its health state for all monitor.

For monitor which should take number of samples which excess the threshold for generate the alert: It will reset the counter when the object exit the maintenance mode This means that it will take at least three consecutive samples to check whether it is over the threshold.

Roger

That completely depends on the type of monitor/rule. In case of a service monitor, you will get an alert as soon as the MM is stopped. Same applies to (for instance) perf.monitors (depending on their schedule).

First statement I fully agree.

The second statement is correct for perf.monitors (if they are configured that way). Other monitors work differently (service monitor, for instance).

/patrick