A team is using Cloud Functions with a Cloud Storage trigger. They notice that sometimes the function does not execute after a file is uploaded. What is the most likely cause?
When object versioning is enabled, the event type for new uploads remains 'finalize', but if you are using the 'archive' event for old versions, that could cause issues. However, the most common root cause is misconfigured event filters.
Why this answer
Cloud Storage triggers use event notifications; if the bucket has object versioning enabled and the event type is not configured correctly, or if the function's event filter is too restrictive, it may not trigger. A common oversight is not setting the event type to 'google.storage.object.finalize'.