Azure Logic App no run failures, thousands of messages in dead-letter

Question

I have an azure logic app with 1 workflow that triggers on message in an Azure Service Bus queue
Lock timeout is set to 5 minutes, session not enabled, max delivery attempt set to 100
There are no workflow runs with errors, yet 2 out of 3 messages end up in dead letter with reason max delivery attempts.

How do I go about debugging this?

Edit: Max delivery attempts was only at 10. I increased to 100 and now it is successful. App insights still don't give any information about failures or anything that explains why it even needs more than 1 delivery attempt.
I'm about to give up since it works, but I would really like to know how debug and optimize this.

Answer 1

Azure Logic App no run failures, thousands of messages in dead-letter

• I agree with @Ziya Mert Karakas to start with Azure Log Analytics and Azure Monitor.
• This might occur for many reasons, for this I can suggest you to check the logs of service bus, If this does not work check the logs of Azure Logic apps.
• You can enable the session in service bus , as it will be helpful in identifying the problem\the root cause.

• When I have reproduced in my environment, it was working fine for me by using the same trigger as you have and below is the glimpse of that trigger:

If still you cannot find the issue, ill suggest you to raise a support request.