Hey everyone, I'm having trouble configuring a trigger via YAML on my self-hosted Prefect server. My goal is to have the create_campaign_flow deployment trigger the trigger_backend_flow deployment when its flow run reaches the Completed state. When I configure the trigger through the Prefect UI using the built-in flow run state template, it works fine. However, when I set it up via YAML, the trigger appears in the UI but never fires. Here's the YAML snippet I'm using:

deployments:
  - <<: *common_deployment
    name: create_campaign_flow
    entrypoint: ./src/flows/flow_automation.py:create_campaign_flow
  
  - <<: *common_deployment
    name: trigger_backend_flow
    entrypoint: ./src/flows/flow_automation.py:trigger_backend_flow
    triggers:
      - enabled: true
        match:
          prefect.resource.id: create_campaign_flow
        expect:
          - prefect.flow-run.Completed
        parameters:
          campaign_id: "{{ flow_run.parameters.campaign_id }}"

I’ve confirmed that each flow runs fine on its own, and the UI configuration for the trigger works as expected. Has anyone encountered a similar issue or have suggestions on what might be wrong with my YAML configuration? I’ve attached a screenshot of the UI trigger configuration as well. Any help is much appreciated!

hi @Yanay Sova

create_campaign_flow

can you find a

prefect.flow-run.Completed

event in the event feed that's an example of what you're trying to event on? can you paste the raw tab here?

instead of using

match

, you can use

match_related

to filter for events that are related to your deployment, which includes state change events that happened as part of deployment runs

match_related:
  prefect.resource.role: deployment
  prefect.resource.id: 
    - <the id of your create_campaign_flow deployment>

as in, expect the

prefect.flow-run.Completed

event from any resource related to create_campaign_flow

Seems like switching to match_related and targeting prefect.resource.name did the trick! now the second flow is being triggered when the first flow finishes in complete state. Thanks for the help @Kevin Grismore @Nate 🙏