By default, SCOM checks the status of the ESI Exchange HA Extension every 90 seconds and raises an alert if the service is not running after three 90-second checks in an interval of 10 minutes (600 seconds).
You can change the monitoring settings as necessary for your monitoring requirements. How to Monitor Using Overrides on Microsoft TechNet provides more details. The alerts for Exchange availability issue remediation failures are based upon events and do not have a monitoring interval.
To change the SCOM monitor overrides for the ESI Exchange HA Extension Monitoring Customization management pack:
Open the SCOM Operations Console and connect to the SCOM Management Group.
From the menu bar, select Go > Authoring or select Authoring from the lower left pane.
From the left pane, select Monitors.
Locate and double-click the EMC SI Exchange High Availability Extension Service State.
Open the Overrides properties and select one of the following choices:
For all objects of class: To override the rule for all instances of the extension.
For a specific object of class: To override for a specific instance of the extension.
Select the EMC Storage Integrator Exchange High Availability Extension Monitoring Customization management pack.
Change the values to your preferred settings.
Click Apply, and verify the changed values.
Click OK, and then click Close.