Attribute Macro trigger 

#[trigger]

Define a trigger that fires a workflow on a schedule or condition.

Custom poll trigger

#[trigger(on = "my_workflow", poll_interval = "5s")]
pub async fn check_inbox() -> Result<TriggerResult, TriggerError> {
    // check condition, return Fire(ctx) or Skip
}

Cron trigger (T-0305)

#[trigger(on = "my_workflow", cron = "0 2 * * *", timezone = "UTC")]