Azure IoT Hub Logs broken for new IoT Hub

Question

Azure IoT Hub Logs broken for new IoT Hub

Timo 20

I have recently created a new IoT Hub using the Azure Portal and followed the same steps that I have previously successfully followed to obtain log information in another IoT Hub, namely:

Create new Diagnostic Settings, ticking "allLogs", "audit", "AllMetrics" and "Send to Log Analytics workspace", selection the same Log Analytics workspace that I'm using for my other IoT Hub.
Connect some devices
Set the correct timezone under "Logs"
Query "AzureActivity" or "AzureDiagnostics" under "Logs"

However, even after all this, the no log results are found!

VasimTamboli 5,215 Reputation points

2023-06-02T16:12:09.91+00:00

you can try:

Verify Log Analytics workspace connection: Double-check that you have selected the correct Log Analytics workspace when configuring the diagnostic settings for your IoT Hub. Ensure that the workspace is properly connected and functioning.

Check if logs are being sent: Confirm if the logs are being sent to the Log Analytics workspace by checking the Diagnostics settings in your IoT Hub. Go to the Azure portal, navigate to your IoT Hub, and select "Diagnostics settings." Ensure that the settings are correctly configured to send the desired logs to the Log Analytics workspace.

Confirm the correct query: Make sure that you are using the correct query syntax when querying the logs in Log Analytics. Ensure that you are using the appropriate table name (e.g., AzureDiagnostics) and the desired time range. You can start with a simple query to test the connection, such as AzureDiagnostics | limit 10.

Check if logs are available: Verify if any logs are available for your IoT Hub. It's possible that there may not be any log data available yet, especially if the IoT Hub was recently created or if there hasn't been any activity generating logs. You can try generating some activity by connecting devices and performing actions to see if logs start appearing.

Monitor the diagnostic settings: Monitor the diagnostic settings to see if there are any errors or issues being reported. Go to the Azure portal, navigate to your IoT Hub, select "Diagnostics settings," and review any error messages or warnings that may provide insights into why the logs are not being collected.
LeelaRajeshSayana-MSFT 17,766 Reputation points Moderator

2023-06-05T19:35:34.54+00:00

Hi @Timo Greetings! I am following up to see if you got a chance to review the above feedback. Please let us know if you have any additional questions or need further assistance.
LeelaRajeshSayana-MSFT 17,766 Reputation points Moderator

2023-06-12T19:47:47.6466667+00:00

Hi @Timo We still have not heard back from you. Just wanted to check if the answer provided below was helpful? If it answers your query, please do click Accept Answer and Yes for the answer, as it might be beneficial to other community members reading this thread. And, if you have any further query do let us know. Thank you

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VasimTamboli 5,215 Reputation points

2023-06-02T16:12:09.91+00:00

you can try:

Verify Log Analytics workspace connection: Double-check that you have selected the correct Log Analytics workspace when configuring the diagnostic settings for your IoT Hub. Ensure that the workspace is properly connected and functioning.

Check if logs are being sent: Confirm if the logs are being sent to the Log Analytics workspace by checking the Diagnostics settings in your IoT Hub. Go to the Azure portal, navigate to your IoT Hub, and select "Diagnostics settings." Ensure that the settings are correctly configured to send the desired logs to the Log Analytics workspace.

Confirm the correct query: Make sure that you are using the correct query syntax when querying the logs in Log Analytics. Ensure that you are using the appropriate table name (e.g., AzureDiagnostics) and the desired time range. You can start with a simple query to test the connection, such as AzureDiagnostics | limit 10.

Check if logs are available: Verify if any logs are available for your IoT Hub. It's possible that there may not be any log data available yet, especially if the IoT Hub was recently created or if there hasn't been any activity generating logs. You can try generating some activity by connecting devices and performing actions to see if logs start appearing.

Monitor the diagnostic settings: Monitor the diagnostic settings to see if there are any errors or issues being reported. Go to the Azure portal, navigate to your IoT Hub, select "Diagnostics settings," and review any error messages or warnings that may provide insights into why the logs are not being collected.
LeelaRajeshSayana-MSFT 17,766 Reputation points Moderator

2023-06-05T19:35:34.54+00:00

Hi @Timo Greetings! I am following up to see if you got a chance to review the above feedback. Please let us know if you have any additional questions or need further assistance.
LeelaRajeshSayana-MSFT 17,766 Reputation points Moderator

2023-06-12T19:47:47.6466667+00:00

Hi @Timo We still have not heard back from you. Just wanted to check if the answer provided below was helpful? If it answers your query, please do click Accept Answer and Yes for the answer, as it might be beneficial to other community members reading this thread. And, if you have any further query do let us know. Thank you

Answer 1

@Timo Greetings!

Create new Diagnostic Settings, ticking "allLogs", "audit", "AllMetrics" and "Send to Log Analytics workspace", selection the same Log Analytics workspace that I'm using for my other IoT Hub.

Connect some devices

Set the correct timezone under "Logs" Query "AzureActivity" or "AzureDiagnostics" under "Logs" However, even after all this, the no log results are found!

I understand that you have followed the above steps. Did you get a chance to see suggestions from VasimTamboli?

There could be several reasons why you're not seeing any logs. Here are some things you can check:

Check if there are any filters applied to the query. If there are filters applied, it may be excluding the logs you're looking for.
Ensure that the correct time range is selected in the Log Analytics workspace. If the time range is set to a period where there is no data, you won't see any logs.
Verify that the devices are sending telemetry data to the IoT Hub. You can check this by running a query for the device telemetry data in the Log Analytics workspace.
Check if there is any delay in the log data ingestion. It may take several minutes for the logs to appear in the Log Analytics workspace after you have created the diagnostic settings.

Hope this helps. Do let us know if that helps to identify the root cause or have any further queries.

Timo 20 Reputation points

2023-06-13T06:17:06.67+00:00

Thank you, I believe 4. was the culprit, it simply took around 10 minutes for the logs to appear.

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Azure IoT Hub Logs broken for new IoT Hub

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