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these scripts run on intervals and not when the actual event happens. if it's no longer running you need to look at the task schedule on the server that runs the script and review the settings. also you can see the below link to assist you will that script.<br />
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<a href="https://docs.microsoft.com/en-us/exchange/high-availability/manage-ha/monitor-dags?view=exchserver-2019#collectovermetricsps1-script" rel="ugc">https://docs.microsoft.com/en-us/exchange/high-availability/manage-ha/monitor-dags?view=exchserver-2019#collectovermetricsps1-script</a>
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these scripts run on intervals and not when the actual event happens. if it's no longer running you need to look at the task schedule on the server that runs the script and review the settings. also you can see the below link to assist you will that script.

https://docs.microsoft.com/en-us/exchange/high-availability/manage-ha/monitor-dags?view=exchserver-2019#collectovermetricsps1-script [https://docs.microsoft.com/en-us/exchange/high-availability/manage-ha/monitor-dags?view=exchserver-2019#collectovermetricsps1-script]

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We have Exchange 2013 in place, i recently had to upgrade the servers to Cu20. &nbsp;Since doing so we are no longer receiving an email notification when mail databases fail over from one server to the other. &nbsp;We used to receive notifications for this, regardless of if the failover was automatic due to issue or if we did it manual (i.e. to perform maintenance). &nbsp;I see a lot of references to powershell script &quot;collectovermetrics.ps1&quot; being able to report on this but i am not clear on how this is triggered. &nbsp;<br />
As I've recently taken over exchange administration, any help in getting the notifications going again would be appreciated.<br />
Thanks!
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We have Exchange 2013 in place, i recently had to upgrade the servers to Cu20.  Since doing so we are no longer receiving an email notification when mail databases fail over from one server to the other.  We used to receive notifications for this, regardless of if the failover was automatic due to issue or if we did it manual (i.e. to perform maintenance).  I see a lot of references to powershell script "collectovermetrics.ps1" being able to report on this but i am not clear on how this is triggered.  
As I've recently taken over exchange administration, any help in getting the notifications going again would be appreciated.
Thanks!

Exchange 2013 Failover Notifications Not working

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.