We can create a health rule on calls per minute metric to check the calls. If the value for call per minute < 1 we can create an alert the there are no call for the application (overall application performance).We can create same rule for tier or node level. Do refer the attached screens.
If we check "Evaluate to true on no data" it will trigger an alert when there is no data reported for that metrics in this case "calls per minute", we can verify metric values under metric browser.
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