The TriggerMode enum includes various settings.

Table: TriggerMode

ParameterTypeRequired[a]DefaultDescription
LegacyAlertboolean  Whether this alert type is a legacy one.
FilterAlertboolean  Whether this alert is a filter.
AggregateAlertboolean  Whether this is an agggregate alert.

[a] Some arguments may be required, as indicated in this column. For some fields, this column indicates that a result will always be returned for it.