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We have an ASP.NET core 2.2 application using Azure Service bus topics and subscriptions.

We have configured the auto delete on idle feature on the subscriptions. After an idle time of 10 minutes the subscriptions are automatically deleted by the Azure infrastructure.

We have enabled the diagnostics logs for our service bus namespace on the Azure portal as explained here. We have verified that we are actually collecting logs and we are able to see them from the Azure portal. So far, so good.

Our problem is that we are not able to find among the collected logs the auto delete of the subscriptions after the configured idle time. Based on this documentation we would expected to see a log entry having an EventName_s with the value AutoDelete Delete Subscription, but we don't. We are sure that during our test at least one subscription has been deleted by the configured auto delete on idle rule.

Are the subscription auto delete events actually logged, as stated in the docs ?

Is there any configuration required to actually see the subscription auto delete events from the service bus diagnostics logs ?

Enrico Massone
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1 Answers1

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@Enrico Massone The information in the document is correct that when you enabled diagnostic logs then you should see autodelete events logs. I have performed a test at my end and was able to see the below event for the configured diagnostic setting streaming the logs to log analytics workspace and storage account.

{ "Environment": "PROD", "Region": "South India", "ScaleUnit": "XXXX", "ActivityId": "249d60c9-780d-4fce-a3dc-69688b576d65", "EventName": "AutoDelete Delete Subscription", "resourceId": "/SUBSCRIPTIONS/XXXXX/RESOURCEGROUPS/XXXX/PROVIDERS/MICROSOFT.SERVICEBUS/NAMESPACES/XXX", "SubscriptionId": "XXXX", "EventTimeString": "11/25/2020 8:01:01 AM +00:00", "EventProperties": "{"SubscriptionId":"XXXXX","Namespace":"XXXX","Via":"AutoDelete","TrackingId":"249d60c9-780d-4fce-a3dc-69688b576d65_B4"}", "Status": "Succeeded", "Caller": "AutoDelete", "category": "OperationalLogs"}

Autodelete has a minimum value of 5 minutes and will trigger only on fulfilling the below conditions

  • No Receives
  • No updates to the subscription
  • No new rules added to the subscription No Browse/Peek
  • No Browse/Peek

If you want I can help you in verifying the logs from the backend whether the auto on idle was triggered or not. You can also perform another test to see if you observe the same behavior.

MayankBargali
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  • thanks. I'm still not able to see the expected logs. I have opened an issue on github https://github.com/Azure/azure-service-bus/issues/402 – Enrico Massone Nov 25 '20 at 16:20