@Marvin, after emitting an event, my automation is being triggered twice, what can be the reason for this?

The issue of your automation being triggered twice could be explored from a couple of angles: 1. Check the Time Constraints on Triggers: Ensure that the triggers are not configured too liberally in terms of time constraints. Sometimes, misconfigured time constraints can cause triggers to fire multiple times. Here’s an insightful documentation excerpt: > "...Placing these time constraints on the triggers can prevent a misfire if you know that the events will generally happen within a specific timeframe, and you don't want a stray older event to be included." > Prefect Automations 2. Investigate Event Handling for Duplicates: There might be scenarios where events are duplicated due to network glitches or misconfigured event emission systems. Verify that your event emission logic generates events once under a defined set of conditions. 3. Look for Known Issues: Similar issues have been reported in GitHub issues. One instance referred to PagerDuty notifications being emitted twice even when the webhook responded successfully: > "The test notification comes through fine, no error notifications from Prefect. It does come through twice though, it has every time I've ever tested it." > GitHub Issue 5955 - PagerDuty Notification Emitted Twice To summarize, carefully review your time constraints and event emission logic. Additionally, peruse GitHub issues for any existing bugs or resolutions related to duplicated events to ensure your setup is configured correctly.

@Marvin This is the event. Anything that doesn't look right?

{
  "id": "1e324f8f-a4cb-490f-bc45-b16b819d1daa",
  "account": "aca43483-5caa-4698-9330-0835d392b42a",
  "event": "historical.upload.event.c510dc2e-8051-4207-9163-8fef58fa51f5.1719486621168471253",
  "occurred": "2024-06-27T11:10:21.168Z",
  "payload": {
    "upload_id": "c510dc2e-8051-4207-9163-8fef58fa51f5",
    "data_requester_id": "749f3b6b-bc94-4648-80fe-cf8fa5a9bfea",
    "framework_id": "0a5038be-6820-46fe-b1e2-835749825329",
    "reporting_period_start": "2011-01-01",
    "reporting_frequency": "Annually",
    "uploaded_by_id": "e7e479c3-c607-4822-8fa9-38bef9676bca",
    "upload_date": "2024-06-27T11:10:21.161684",
    "file_registry_id": "d34e639a-80df-4504-9f5a-74bb7c4dd40a",
    "is_non_company_use_case": false,
    "resubmission": true
  },
  "received": "2024-06-27T11:10:21.354Z",
  "related": [],
  "resource": {
    "prefect.resource.id": "data.api.upload.c510dc2e-8051-4207-9163-8fef58fa51f5",
    "prefect.resource.name": "trigger-historical-upload",
    "prefect.resource.role": "trigger"
  },
  "workspace": "12384c92-d7a1-4bcd-a005-37340fd6507c"
}

Your message was too long by 176 tokens - please shorten it and try again. For reference, here's your message at the allowed limit:

This is the event. Anything that doesn't look right?

```{ "id": "1e324f8f-a4cb-490f-bc45-b16b819d1daa", "account": "aca43483-5caa-4698-9330-0835d392b42a", "event": "historical.upload.event.c510dc2e-8051-4207-9163-8fef58fa51f5.1719486621168471253", "occurred": "2024-06-27T111021.168Z", "payload": { "upload_id": "c510dc2e-8051-4207-9163-8fef58fa51f5", "data_requester_id": "749f3b6b-bc94-4648-80fe-cf8fa5a9bfea", "framework_id": "0a5038be-6820-46fe-b1e2-835749825329", "reporting_period_start": "2011-01-01", "reporting_frequency": "Annually", "uploaded_by_id": "e7e479c3-c607-4822-8fa9-38bef9676bca", "upload_date": "2024-06-27T111021.

@Marvin this is the raw event, anything that does not look right?

{
  "id": "1e324f8f-a4cb-490f-bc45-b16b819d1daa",
  "account": "aca43483-5caa-4698-9330-0835d392b42a",
  "event": "historical.upload.event.c510dc2e-8051-4207-9163-8fef58fa51f5.1719486621168471253",
  "occurred": "2024-06-27T11:10:21.168Z",
  "payload": {
    "upload_id": "c510dc2e-8051-4207-9163-8fef58fa51f5",
  },
  "received": "2024-06-27T11:10:21.354Z",
  "related": [],
  "resource": {
    "prefect.resource.id": "data.api.upload.c510dc2e-8051-4207-9163-8fef58fa51f5",
    "prefect.resource.name": "trigger-historical-upload",
    "prefect.resource.role": "trigger"
  },
  "workspace": "12384c92-d7a1-4bcd-a005-37340fd6507c"
}

The raw event data itself looks structurally fine, but there are a few things you can consider checking: 1. Idempotency: Ensure that your system handling these events is idempotent, meaning processing the same event multiple times won't result in duplicate actions. 2. Event Deduplication: Check if there's a mechanism to deduplicate events within your system. Events occurring closely within a short period, as evidenced by the

occurred

and

received

timestamps, might be triggering the automation twice. 3. Resource Role and Name: Ensure that these are uniquely assigned and there isn't another part of your system emitting a similar event that matches these conditions:

json
    "prefect.resource.name": "trigger-historical-upload"
    "prefect.resource.role": "trigger"

4. Timestamp Precision: The

occurred

and

received

timestamps are very close (186 ms apart). Ensure that your system’s timing or retry mechanism isn’t inadvertently treating the same event as different. 5. Related Events: Although the

related

array is empty, ensure that any related events aren’t causing a duplicate trigger indirectly by design. 6. General Logging and Monitoring: Implement comprehensive logging around the event listening and processing areas to catch potential duplicate emissions or misfires. Given your raw event:

json
{
  "id": "1e324f8f-a4cb-490f-bc45-b16b819d1daa",
  "account": "aca43483-5caa-4698-9330-0835d392b42a",
  "event": "historical.upload.event.c510dc2e-8051-4207-9163-8fef58fa51f5.1719486621168471253",
  "occurred": "2024-06-27T11:10:21.168Z",
  "payload": {
    "upload_id": "c510dc2e-8051-4207-9163-8fef58fa51f5"
  },
  "received": "2024-06-27T11:10:21.354Z",
  "related": [],
  "resource": {
    "prefect.resource.id": "data.api.upload.c510dc2e-8051-4207-9163-8fef58fa51f5",
    "prefect.resource.name": "trigger-historical-upload",
    "prefect.resource.role": "trigger"
  },
  "workspace": "12384c92-d7a1-4bcd-a005-37340fd6507c"
}

To debug: - Ensure no secondary process is emitting. - Log events to identify if duplicates stem from retries or other parts of your infrastructure. - Consider adding mechanisms to ignore events with the same

id

processed within a short timeframe. For more detailed understanding, reviewing the automation setup and event listeners' code might help pinpoint the exact cause.

@Marvin This event sometimes triggers one automation (as expected), but other times several instances of same automation, what's wrong?

{
  "id": "aca43483-879d-4217-9fe9-379e6b81fb1f",
  "account": "f915df50-5caa-4698-9330-0835d392b42a",
  "event": "historical.upload.event.c510dc2e-8051-4207-9163-8fef58fa51f5",
  "occurred": "2024-06-27T14:19:06.754Z",
  "payload": {
    "upload_id": "1234"
  },
  "received": "2024-06-27T14:31:20.374Z",
  "related": [],
  "resource": {
    "prefect.resource.id": "novata.data.api.upload.c510dc2e-8051-4207-9163-8fef58fa51f5",
    "prefect.resource.name": "trigger-historical-upload",
    "prefect.resource.role": "trigger"
  },
  "workspace": "38684c92-d7a1-4bcd-a005-37340fd6507c"
}

I can provide the automation config if needed

Yes, please provide the automation configuration. Reviewing it will help in identifying possible misconfigurations or issues that might lead to multiple triggers of the same automation. Additionally, ensure to include any relevant details about how events are processed and how the automations are set up to handle these events.

Events are only emitted once, and each automation triggers one flow

Thank you for sharing the automation configuration. Let's review it step-by-step: 1. Event Type: The automation is configured to listen for events of type

"event"

. 2. Match Criteria: The automation is set to match events where

prefect.resource.id

follows the pattern

novata.data.api.upload.*

. 3. Expectations: It expects events with names pattern-matching

historical.upload.event.*

. 4. Posture: The automation posture is set to

"Reactive"

. 5. Threshold: The threshold is set to

1

, meaning it triggers when at least one event matches. 6. Within: Set to

0

, meaning there's no time constraint applied for event occurrence. ## Potential Issues and Fixes ### Event Emission You mentioned that events are only emitted once. It’s important to log or trace the system emitting these events to confirm that no duplicates are generated at this step. Even minor variations in the emitted event might cause multiple triggers. ### Automation Configuration While the configuration seems appropriate at first glance, there are a few areas you might want to reconsider or investigate further: 1. Idempotency: Make sure the flow triggered by this automation can handle repeated executions gracefully. This often isn't part of the automation configuration but is rather an aspect of the flow's design. 2. Monitor Event Listeners: Ensure that your event listeners do not inadvertently process the same event multiple times. Enhanced logging around event consumption will help clarify if and why this occurs. 3. Match Patterns: Your match pattern and expectations are broad. Consider providing more specific patterns to see if that reduces the multiple triggers:

json
    "match": {
      "prefect.resource.id": "novata.data.api.upload.c510dc2e-8051-4207-9163-8fef58fa51f5"
    },
    "expect": [
      "historical.upload.event.c510dc2e-8051-4207-9163-8fef58fa51f5"
    ]

4. Concurrency Control: If feasible, introduce a mechanism to prevent concurrent execution of the same flow. This can be achieved by maintaining a state or lock to avoid triggering the same automation multiple times. ### Review Provided Event Example Given your example event:

json
{
  "id": "aca43483-879d-4217-9fe9-379e6b81fb1f",
  "account": "f915df50-5caa-4698-9330-0835d392b42a",
  "event": "historical.upload.event.c510dc2e-8051-4207-9163-8fef58fa51f5",
  "occurred": "2024-06-27T14:19:06.754Z",
  "payload": {
    "upload_id": "1234"
  },
  "received": "2024-06-27T14:31:20.374Z",
  "related": [],
  "resource": {
    "prefect.resource.id": "novata.data.api.upload.c510dc2e-8051-4207-9163-8fef58fa51f5",
    "prefect.resource.name": "trigger-historical-upload",
    "prefect.resource.role": "trigger"
  },
  "workspace": "38684c92-d7a1-4bcd-a005-37340fd6507c"
}

This configuration is acceptable, but varying emission times and payload minutiae can cause multiple triggers. ### Summary #### Immediate Steps: 1. Add Detailed Logging: Ensure that every step from event emission, through matching, to flow execution is logged for diagnosis. 2. Verify Idempotency: Design and test your flows to handle repeated triggers gracefully. 3. Adjust Patterns: Narrow down matching and expectation patterns to be as specific as possible, reducing scope for misfires. 4. Concurrency Control: Wherever feasible, implement locks or state checks to prevent redundant flow executions. These actions should help identify and resolve the underlying reasons for multiple triggers of the same automation.