Use initiatedEvent for startChildFailed event grouping

[Alex-Tideman]

Description & motivation 💭

Properly group StartChildWorkflowExecutionFailed event with it's matching StartChildWorkflowExecutionInitiated event

Screenshots (if applicable) 📸

Design Considerations 🎨

Testing 🧪

How was this tested 👻

• Manual testing
• E2E tests added
• Unit tests added

Steps for others to test: 🚶🏽‍♂️🚶🏽‍♀️

Checklists

Draft Checklist

Merge Checklist

Issue(s) closed

Docs

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	Apr 23, 2026 2:50pm

[temporal-cicd]

• ⚠️ 'event.startChildWorkflowExecutionFailedEventAttributes' is possibly 'null' or 'undefined'.

[temporal-cicd]

• ⚠️ 'event.timerFiredEventAttributes' is possibly 'null' or 'undefined'.

[temporal-cicd]

Warnings

⚠️

📊 Strict Mode: 29 errors in 1 file (2.9% of 999 total) src/lib/models/event-groups/get-group-id.ts (29) L35:18: 'event.activityTaskStartedEventAttributes' is possibly 'null' or 'undefined'. L38:18: 'event.activityTaskCanceledEventAttributes' is possibly 'null' or 'undefined'. L43:6: 'event.activityTaskCancelRequestedEventAttributes' is possibly 'null' or 'undefined'. L48:18: 'event.activityTaskFailedEventAttributes' is possibly 'null' or 'undefined'. L52:18: 'event.activityTaskTimedOutEventAttributes' is possibly 'null' or 'undefined'. L56:18: 'event.activityTaskCompletedEventAttributes' is possibly 'null' or 'undefined'. L61:6: 'event.childWorkflowExecutionStartedEventAttributes' is possibly 'null' or 'undefined'. L67:6: 'event.childWorkflowExecutionTerminatedEventAttributes' is possibly 'null' or 'undefined'. L73:6: 'event.childWorkflowExecutionCompletedEventAttributes' is possibly 'null' or 'undefined'. L79:6: 'event.childWorkflowExecutionCanceledEventAttributes' is possibly 'null' or 'undefined'. L85:6: 'event.childWorkflowExecutionFailedEventAttributes' is possibly 'null' or 'undefined'. L91:6: 'event.childWorkflowExecutionTimedOutEventAttributes' is possibly 'null' or 'undefined'. L97:6: 'event.startChildWorkflowExecutionFailedEventAttributes' is possibly 'null' or 'undefined'. L102:18: 'event.timerFiredEventAttributes' is possibly 'null' or 'undefined'. L106:18: 'event.timerCanceledEventAttributes' is possibly 'null' or 'undefined'. L111:6: 'event.workflowExecutionUpdateCompletedEventAttributes' is possibly 'null' or 'undefined'. L117:6: 'event.externalWorkflowExecutionSignaledEventAttributes' is possibly 'null' or 'undefined'. L122:18: 'event.workflowTaskStartedEventAttributes' is possibly 'null' or 'undefined'. L126:18: 'event.workflowTaskCompletedEventAttributes' is possibly 'null' or 'undefined'. L130:18: 'event.workflowTaskFailedEventAttributes' is possibly 'null' or 'undefined'. L134:18: 'event.workflowTaskTimedOutEventAttributes' is possibly 'null' or 'undefined'. L138:18: 'event.nexusOperationStartedEventAttributes' is possibly 'null' or 'undefined'. L143:6: 'event.nexusOperationCompletedEventAttributes' is possibly 'null' or 'undefined'. L148:18: 'event.nexusOperationFailedEventAttributes' is possibly 'null' or 'undefined'. L152:18: 'event.nexusOperationCanceledEventAttributes' is possibly 'null' or 'undefined'. L156:18: 'event.nexusOperationTimedOutEventAttributes' is possibly 'null' or 'undefined'. L161:6: 'event.nexusOperationCancelRequestedEventAttributes' is possibly 'null' or 'undefined'. L167:6: 'event.nexusOperationCancelRequestCompletedEventAttributes' is possibly 'null' or 'undefined'. L174:6: 'event.nexusOperationCancelRequestFailedEventAttributes' is possibly 'null' or 'undefined'.

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