Yes. A single

DeploymentEventTrigger

treats multiple

expect

values as OR. To get AND semantics (only trigger after all three events have occurred), wrap three event triggers in a

DeploymentCompoundTrigger

with

require="all"

. Example (Prefect 3.x), order does not matter and all three must arrive within 1 hour:

from datetime import timedelta
from prefect import flow
from prefect.events.schemas.deployment_triggers import DeploymentCompoundTrigger

@flow
def my_flow():
    ...

my_flow.serve(
    name="process-all-datasets",
    triggers=[
        DeploymentCompoundTrigger(
            require="all",
            within=timedelta(hours=1),  # optional time window
            triggers=[
                {
                    "type": "event",
                    "expect": ["dataset_a"],
                    "match": {"prefect.resource.id": "etl-events.transform"},
                },
                {
                    "type": "event",
                    "expect": ["dataset_b"],
                    "match": {"prefect.resource.id": "etl-events.transform"},
                },
                {
                    "type": "event",
                    "expect": ["dataset_c"],
                    "match": {"prefect.resource.id": "etl-events.transform"},
                },
            ],
        )
    ],
)

Notes: - Duplicates of the same event won’t prematurely fire the compound trigger; each child trigger must fire at least once. - Add

within

to ensure all three events occur in a bounded window; otherwise older events can accumulate indefinitely. - If order matters, use a

DeploymentSequenceTrigger

instead of a compound trigger. Docs: - Event triggers (concepts) - Automations (concepts) - DeploymentCompoundTrigger API Follow-up questions: - Do these events need to arrive in a specific order? - Do you want a specific time window (e.g., all three within N minutes/hours) to avoid stale events triggering later?