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<@ULVA73B9P> I have the following trigger for an a...
# ask-marvin
t
@Marvin I have the following trigger for an automation to notify me when a flow enters a certain state. Is there a way to edit this JSON trigger to trigger on all flows except certain flows specified by id?
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{
  "type": "event",
  "match": {
    "prefect.resource.id": "prefect.flow-run.*"
  },
  "match_related": {},
  "after": [],
  "expect": [
    "prefect.flow-run.TimedOut",
    "prefect.flow-run.Failed",
    "prefect.flow-run.AwaitingRetry",
    "prefect.flow-run.Retrying",
    "prefect.flow-run.Crashed"
  ],
  "for_each": [
    "prefect.resource.id"
  ],
  "posture": "Reactive",
  "threshold": 1,
  "within": 0
}
m
To trigger an event for all flow runs except those with specific IDs, you'll want to make use of an exclusion filter in your trigger configuration. However, it seems that the ControlFlow documentation (which is based on Prefect 3.x) does not directly provide an out-of-the-box way to exclude specific flow IDs in the trigger JSON syntax. One approach would be to modify your event trigger logic to incorporate a condition that excludes certain flow IDs programmatically either by using additional configurations or manipulation through orchestration scripts. You would typically need to handle such exclusions in the processing logic that consumes these events. For a more thorough solution, you might need to devise additional logic within your event processing layer to explicitly ignore triggers coming from specific flow IDs. Unfortunately, without explicit support in the trigger syntax, this requires a bit of a manual setup. If you are aiming to accomplish this directly within Prefect or ControlFlow and need detailed examples or discussion, I recommend checking user forums or their GitHub issues for community-shared solutions or requests for such features. Here's the ControlFlow documentation for more context on flow configurations, though it might not directly answer this specific need related to event triggers. If you have further questions or need help with implementing the exclusion logic outside of Prefect triggers, let me know!
t
@Marvin I am not using ControlFlow currently, I am using Prefect 3.x with Prefect Cloud
m
In Prefect 3.x, setting up a trigger to exclude specific flow IDs directly via JSON configuration is not natively supported. Prefect's trigger configurations allow you to match events based on criteria like specific resource IDs, but it doesn't provide an out-of-the-box means to exclude certain IDs in the pre-processing step. To achieve your requirement—triggering on all flows except specified IDs—you'd typically handle this either in the automation logic after an event is detected or through a custom setup within your orchestration layer. Here's a potential workaround approach: 1. Use Match Filters: You could start by using these to get events related to flow runs. 2. Post-Processing: After events pass through the match filters, use an external script or logic to filter out flow runs with the specific IDs you want to exclude before taking action. You'll likely need to implement additional logic where the automation trigger results (like a webhook or a listener) are consumed, to filter out events based on your specific criteria at that point. For more details on triggers and custom setups, you can refer to the Prefect 3.x Custom Triggers Documentation. It's a tad like crafting a perfect cup of coffee, where you need to handle the brew after the filter has let all the rich flavors pass through—except in your case, you're being a bit picky about which beans make it into the cup!
In Prefect 3.x with Prefect Cloud, configuring triggers to exclude specific flow IDs directly within the JSON syntax isn't straightforward. The configuration primarily handles inclusion criteria but doesn't offer a built-in mechanism to exclude specific IDs without additional logic. Here's a workaround you can consider: 1. Filtered Events: Set up your event triggers as you normally would to catch all the desired flow-run events. 2. External Filtering Logic: Once the events are triggered, you can handle the filtering logic outside of Prefect in your event processing layer (like a webhook receiver or any other event handler you are using). This additional logic can discard or ignore events from the specific flow IDs you want to exclude. You might have to enable this through a server-side function or script that checks the 
flow ID
against a list of excluded IDs before performing any subsequent actions. For detailed information on setting up and customizing triggers, you might want to refer to the Prefect 3.x Custom Triggers Documentation. Think of it as adding a sneaky little bouncer at the club entrance (post-event handling) who checks the guest list, rather than at the ticket booth (event trigger configuration).
t
@Marvin What if I wanted to edit my JSON trigger to only notify me when flows with a tag enter a certain state?
m
To set up your JSON trigger to notify you only when flows with a specific tag enter certain states in Prefect 3.x, you need to include the tag in the "match" criteria. Here's a concise way of editing your trigger: 1. Match Criteria for Tags: Add the tags you want to monitor under 
prefect.flow-run.tags
. 2. Specify State Expectations: Indicate the particular states that should trigger the notification. Here's an example JSON structure for your trigger:
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json
{
  "type": "event",
  "match": {
    "prefect.resource.id": "prefect.flow-run.*",
    "prefect.flow-run.tags": ["your-specific-tag"]
  },
  "match_related": {},
  "after": [],
  "expect": [
    "prefect.flow-run.TimedOut",
    "prefect.flow-run.Failed",
    "prefect.flow-run.AwaitingRetry",
    "prefect.flow-run.Retrying",
    "prefect.flow-run.Crashed"
  ],
  "for_each": [
    "prefect.resource.id"
  ],
  "posture": "Reactive",
  "threshold": 1,
  "within": 0
}
Replace 
"your-specific-tag"
with the tag you're interested in. This setup filters events for flow runs with that specific tag and notifies you when they reach any of the specified states. For more details, please check the Prefect 3.x Custom Triggers Documentation. Think of it as ordering a pizza with your favorite toppings only—ensuring you get just what you crave whenever it’s available!
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