TriggerMode is an enumerated list of trigger modes for aggregate alerts.

This enumerated datatype is used by four datatypes: AggregateAlert, which is used by a few mutations and queries; CreateAggregateAlert, which is used by the createAggregateAlert() mutation field; UpdateAggregateAlert, which is used by the updateAggregateAlert() mutation; and UnsavedAggregateAlert, which is used by the generateAggregateAlertFromTemplate() and generateAggregateAlertFromPackageTemplate() query fields.