Blob Storage with Event Grid Recipe
Blob trigger via Event Grid for high-scale, low-latency blob processing.
Template Selection
Resource filter: blob Discover templates via MCP or CDN manifest where resource == "blob" and language matches user request.
Why Event Grid?
| Aspect | Polling Trigger | Event Grid Source |
|---|---|---|
| Latency | 10s-60s | Sub-second |
| Scale | Limited | High-scale |
Troubleshooting
"Unauthorized" or "Forbidden" Errors
Cause: Missing UAMI credential settings for Storage. Solution: Ensure these settings are present in app configuration (prefix must match the connection name used in your function code, default: AzureWebJobsStorage):
<ConnectionName>__blobServiceUri(e.g.,https://<account>.blob.core.windows.net)<ConnectionName>__credential(value:managedidentity)<ConnectionName>__clientId
See Blob Storage trigger connections for identity-based config — refer to the "Connections" section on that page for managed identity app settings.
Blob Events Not Triggering
Cause: Event Grid subscription not created or filtering incorrectly. Solution: Verify the Event Grid system topic and subscription exist. Check the blob container prefix filter matches the expected path.
Eval
| Path | Description |
|---|---|
| eval/summary.md | Evaluation summary |
| eval/python.md | Python evaluation results |