Handling failures

You can use a failure Output Port to notify the Function that an invocation has failed. For HTTP triggers, there is no retry. For Event Grid triggers, Azure Event Grid may automatically retry the invocation, if configured in the Event Subscription, for a default of 30 attempts. After that, if it still fails, the Event Subscription will simply drop the event notification. This could result in data loss, as it means that our Function App will not have a chance to process the data again.