I have a Logic App that uses the Outlook connector's "When a new email arrives (V3)" trigger. The trigger's configuration is precise; it only looks for new emails in a specific folder with a specific sender and subject, and emails that have an attachment. When a new, matching email arrives, the trigger begins a Logic App instance as expected. In the trigger history, however, there seems to be some kind of polling behavior going on. The trigger is consistently evaluated and logged as either "Skipped" or "Succeeded" every hour, twice per hour. This happens even though no new emails are arriving in that folder.
The Logic App's run history correctly reflects the number of Logic App instances that have run. Those are expected. But why is the trigger evaluating (and charging me) when no new emails are arriving? The consistency of the evaluations (same time every hour) suggests this is a polling behavior. But I haven't seen documentation on the "When a new email arrives (V3)" trigger that would explain this behavior.