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You can set up alerts for Custom Metrics using the Alerts Management tool and start monitoring their performance. Read more about setting up alerts here.
How to create Custom Metrics?
If you do not have any custom metrics set up and wish to do so, you would first need to create a Calculated Metric on the All Accounts Dashboard. You can find instructions to do so here.
Any Calculated Metrics (Custom Metrics) that you create on the All Accounts dashboard will be displayed in the 'Metric to monitor' dropdown while configuring an Alert.
Supported Platforms
Custom Metrics are available for Google Ads, Microsoft Ads, and Amazon Ads.
For Amazon Ads, however, the following metrics are not supported:
All Conversions
All Conversion Value
So if you were to select in a dropdown a custom metric that uses any of these two metrics in the formula, we will return the number of conversions as 0, and no alert will be triggered for this platform.