OpenSearch/watcher/docs/reference/trigger.asciidoc

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[[trigger]]
=== Trigger
Every watch must have a `trigger` that defines when the watch execution process should start.
When you create a watch, its trigger is registered with the appropriate _trigger engine_.
The trigger engine is responsible for evaluating the trigger and triggering the watch
when needed.
Watcher is designed to support different types of triggers, but
only time-based <<trigger-schedule, `schedule`>> triggers are currently available.
include::trigger/schedule.asciidoc[]