Send Test Notification results in "An unexpected error occurred. Error ID: 'None'"

[smares]

Self-Hosted Version

26.7.0

CPU Architecture

aarch64

Docker Version

29.6.2

Docker Compose Version

5.3.1

Machine Specification

• My system meets the minimum system requirements of Sentry

Installation Type

Upgrade from 26.1 to 26.5, 26.6 then 26.7

Steps to Reproduce

1. Go to Monitor -> Alerts
2. Create alert
3. For THEN select Notify on preferred channel, then choose Notify member and select a member
4. Click Send Test Notification

Expected Result

Test notification should be sent to user

Actual Result

An unexpected error occurred. Error ID: 'None'

docker compose logs shows this:

web-1                                                        | Traceback (most recent call last):                                                                                                                                                                                                                                                                                                                                                                                            
web-1                                                        |   File "/usr/src/sentry/src/sentry/workflow_engine/processors/detector.py", line 107, in get_detectors_for_event_data                                                                                                                                                                                                                                                                                                         
web-1                                                        |     issue_stream_detector = Detector.get_issue_stream_detector_for_project(                                                                                                                                                                                                                                                                                                                                                   
web-1                                                        |         event_data.group.project_id                                                                                                                                                                                                                                                                                                                                                                                           
web-1                                                        |     )                                                                                                                                                                                                                                                                                                                                                                                                                         
web-1                                                        |   File "/usr/src/sentry/src/sentry/workflow_engine/models/detector.py", line 139, in get_issue_stream_detector_for_project                                                                                                                                                                                                                                                                                                    
web-1                                                        |     return cls.get_default_detector_for_project(project_id, IssueStreamGroupType.slug)                                                                                                                                                                                                                                                                                                                                        
web-1                                                        |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                                                                                                                                                                                                                                        
web-1                                                        |   File "/usr/src/sentry/src/sentry/workflow_engine/models/detector.py", line 125, in get_default_detector_for_project                                                                                                                                                                                                                                                                                                         
web-1                                                        |     detector = cls.objects.get(project_id=project_id, type=detector_type)                                                                                                                                                                                                                                                                                                                                                     
web-1                                                        |   File "/.venv/lib/python3.13/site-packages/django/db/models/manager.py", line 87, in manager_method                                                                                                                                                                                                                                                                                                                          
web-1                                                        |     return getattr(self.get_queryset(), name)(*args, **kwargs)                                                                                                                                                                                                                                                                                                                                                                
web-1                                                        |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^                                                                                                                                                                                                                                                                                                                                                                
web-1                                                        |   File "/.venv/lib/python3.13/site-packages/django/db/models/query.py", line 635, in get                                                                                                                                                                                                                                                                                                                                      
web-1                                                        |     raise self.model.DoesNotExist(                                                                                                                                                                                                                                                                                                                                                                                            
web-1                                                        |         "%s matching query does not exist." % self.model._meta.object_name                                                                                                                                                                                                                                                                                                                                                    
web-1                                                        |     )                                                                                                                                                                                                                                                                                                                                                                                                                         
web-1                                                        | sentry.workflow_engine.models.detector.Detector.DoesNotExist: Detector matching query does not exist.                                                                                                                                                                                                                                                                                                                         
web-1                                                        | 19:15:00 [ERROR] sentry.workflow_engine.processors.detector: Issue stream detector not found for event (project_id=1 group_id=306)                                                                                                                                                                                                                                                                                            
web-1                                                        | Traceback (most recent call last):                                                                                                                                                                                                                                                                                                                                                                                            
web-1                                                        |   File "/usr/src/sentry/src/sentry/workflow_engine/processors/detector.py", line 176, in get_preferred_detector                                                                                                                                                                                                                                                                                                               
web-1                                                        |     raise Detector.DoesNotExist("No detectors found for event")                                                                                                                                                                                                                                                                                                                                                               
web-1                                                        | sentry.workflow_engine.models.detector.Detector.DoesNotExist: No detectors found for event                                                                                                                                                                                                                                                                                                                                    
web-1                                                        | 19:15:01 [ERROR] sentry.workflow_engine.processors.detector: Detector not found for event data (type=<class 'sentry.services.eventstore.models.GroupEvent'> id='bca89751683d4b3bb3d67a9173c68eac' group_id=306)                                                                                                                                                                                                               
web-1                                                        | Traceback (most recent call last):                                                                                                                                                                                                                                                                                                                                                                                            
web-1                                                        |   File "/usr/src/sentry/src/sentry/workflow_engine/endpoints/utils/test_fire_action.py", line 21, in test_fire_action                                                                                                                                                                                                                                                                                                         
web-1                                                        |     action.trigger(                                                                                                                                                                                                                                                                                                                                                                                                           
web-1                                                        |     ~~~~~~~~~~~~~~^                                                                                                                                                                                                                                                                                                                                                                                                           
web-1                                                        |         event_data=event_data,                                                                                                                                                                                                                                                                                                                                                                                                
web-1                                                        |         ^^^^^^^^^^^^^^^^^^^^^^                                                                                                                                                                                                                                                                                                                                                                                                
web-1                                                        |         notification_uuid=str(uuid.uuid4()),                                                                                                                                                                                                                                                                                                                                                                                  
web-1                                                        |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                                                                                                                                                                                                                                                                                  
web-1                                                        |         workflow_id=workflow_id,                                                                                                                                                                                                                                                                                                                                                                                              
web-1                                                        |         ^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                                                                                                                                                                                                                                                                                              
web-1                                                        |     )                                                                                                                                                                                                                                                                                                                                                                                                                         
web-1                                                        |     ^                                                                                                                                                                                                                                                                                                                                                                                                                         
web-1                                                        |   File "/usr/src/sentry/src/sentry/workflow_engine/models/action.py", line 136, in trigger                                                                                                                                                                                                                                                                                                                                    
web-1                                                        |     detector = get_preferred_detector(event_data)                                                                                                                                                                                                                                                                                                                                                                             
web-1                                                        |   File "/usr/src/sentry/src/sentry/workflow_engine/processors/detector.py", line 176, in get_preferred_detector                                                                                                                                                                                                                                                                                                               
web-1                                                        |     raise Detector.DoesNotExist("No detectors found for event")                                                                                                                                                                                                                                                                                                                                                               
web-1                                                        | sentry.workflow_engine.models.detector.Detector.DoesNotExist: No detectors found for event                                                                                                                                                                                                                                                                                                                                    
web-1                                                        | 19:15:01 [WARNING] sentry.workflow_engine.endpoints.utils.test_fire_action: email.test_alert.unexpected_exception                                                                                                                                                                                                                                                                                                             
web-1                                                        | 19:15:01 [INFO] sentry_sdk.errors: DedupeIntegration dropped duplicated error event No detectors found for event                                                                                                                                                                                                                                                                                                              
web-1                                                        | 19:15:01 [INFO] sentry_sdk.errors: event processor (<function DedupeIntegration.setup_once.<locals>.processor at 0xf07871bb0e00>) dropped event  

I got to this place because during the update process from 26.1 to 26.7, notifications got moved and our notifications should've been migrated, but they weren't.

Event ID

No response

[sentry-pierre]

This is a clear migration gap. The workflow engine was enabled in self-hosted 26.7.0 via #4364, and the stack trace shows Detector.DoesNotExist because the default issue-stream detector for your project wasn't created during the upgrade.

Two quick questions:

• Did any migration steps fail or get skipped during the 26.1 → 26.7 upgrade?
• Do real alert notifications (not test) work, or do they also throw the same error?

This looks like it needs a sentry-side migration or fallback to auto-create missing default detectors for existing projects when the workflow engine is turned on.

[smares]

I don't see any errors in the logs.

...
Operations to perform:
  Apply all migrations: auth, contenttypes, discover, explore, feedback, flags, hybridcloud, insights, monitors, nodestore, notifications, preprod, releases, replays, seer, sentry, sessions, sites, social_auth, tempest, uptime, workflow_engine
Running migrations:
  Applying sentry.1116_add_project_custom_inbound_filter... OK
  Applying sentry.1117_drop_organizationmapping_codecov_access_delete... OK
  Applying sentry.1118_add_group_derived_data... OK
  Applying explore.0008_add_trace_item_attribute_context... OK
  Applying explore.0009_add_trace_item_attribute_value_context... OK
  Applying explore.0010_remove_last_received_from_attribute_context... OK
  Applying hybridcloud.0031_remove_externalactorreplica_pending... OK
  Applying hybridcloud.0032_delete_externalactorreplica... OK
  Applying sentry.1119_add_sentryapp_webhook_headers... OK
  Applying sentry.1120_add_organization_identity... OK
  Applying sentry.1121_add_organizationcontributoraction... OK
  Applying sentry.1122_profilechunkattachment... OK
  Applying sentry.1123_pending_user... OK
  Applying sentry.1124_weeklyreportprojectexclusion... OK
  Applying sentry.1125_transactions_to_spans_alerts_self_hosted... OK
  Applying sentry.1126_transactions_to_spans_widgets_self_hosted... OK
  Applying sentry.1127_discover_to_explore_queries_self_hosted... OK
  Applying seer.0019_add_night_shift_run_shard... OK
  Applying seer.0020_backfill_night_shift_run_shards...Seer Night Shift Runs
17:41:48 [INFO] sentry.seer.migrations.0020_backfill_night_shift_run_shards: backfill_night_shift_run_shards.done (shards_created=0)
 OK
  Applying seer.0021_drop_night_shift_run_seer_run_state... OK
  Applying seer.0022_drop_night_shift_run_seer_run_column... OK
  Applying seer.0023_add_seer_run_pull_request... OK
  Applying seer.0024_add_seerrun_referrer... OK
  Applying seer.0025_add_seerrun_referrer_index... OK
  Applying seer.0026_add_night_shift_result_idempotency_key... OK
  Applying sentry.1128_remove_savedsearch... OK
  Applying sentry.1129_drop_saved_search... OK
  Applying sentry.1130_pullrequest_metrics_human_involvement... OK
  Applying sentry.1131_add_organizationcontributors_provider... OK
  Applying sentry.1132_add_organizationcontributors_hostname... OK
  Applying sentry.1133_pullrequest_activity_log... OK
  Applying workflow_engine.0115_add_group_index_to_wfh... OK
17:41:57 [WARNING] sentry.batching-kafka-consumer: Topic 'taskworker-process-segments-dlq' or its partitions are not ready, retrying...
Creating missing DSNs
Correcting Group.num_comments counter
...

Anything I should be grepping for?

If I create a notification for one of our projects and proceed to save the form, the alert then shows "This alert is not connected to a project or monitor and will not trigger." and if I edit it, there is no project selected any longer. I can re-add the project and save, only for it to be gone again on next edit.

[aldy505]

Can you provide a screenshot of your "steps to reproduce"? Email is a very simple alert notification and it shouldn't fail...