Enable diagnostics logging

1. Sign in to the Azure portal and navigate to the virtual machine you want to enable diagnostics logging for.

2. Under the Monitoring section, select Diagnostics settings.

3. Click on the "Add diagnostic setting" button to create a new diagnostic setting.

4. Provide a name for the diagnostic setting, such as "VM Diagnostic Logs."

5. Under the "Logs" section, select the logs you want to enable. For example, you can enable "Guest OS diagnostics" to collect operating system-level logs.

6. Choose the desired retention period for the logs.

7. Under the "Destination" section, select where you want to send the logs. You can choose to stream logs to an Azure Storage account or send them to an Azure Event Hub.

8. Configure the additional settings according to your requirements.

9. Click on the "Save" button to enable diagnostics logging for the virtual machine.

Enabling Diagnostics Logging for Azure App Service:

1. Navigate to the Azure portal and select your App Service.

2. Under the Monitoring section, click on "Diagnostic logs" to access the diagnostic settings.

3. Click on the "Turn on diagnostics" button to enable diagnostics logging.

4. Select the desired logs you want to enable, such as HTTP logs, detailed error messages, or application logs.

5. Choose a retention period for the logs.

6. Under the "Destination" section, select either "Storage account" or "Log Analytics workspace" to store the logs.

7. Configure any additional settings and click on the "Save" button to enable diagnostics logging for the App Service.

Enabling Diagnostics Logging for Azure Storage:

1. Open the Azure portal and navigate to your Storage account.

2. Under the Monitoring section, select "Diagnostic settings" to proceed.

3. Click on the "Add diagnostic setting" button to create a new diagnostic setting.

4. Provide a name for the diagnostic setting, such as "Storage Diagnostic Logs."

5. Select the logs you want to enable, such as "Blob, Table, Queue, and File service logs."

6. Choose the desired retention period for the logs.

7. Under the "Destination" section, specify where you want to send the logs. You can choose an Azure Storage account or an Azure Event Hub.

8. Optionally, you can configure additional settings such as metrics and log filtering.

9. Click on the "Save" button to enable diagnostics logging for Azure Storage.

In conclusion, by enabling diagnostics logging for your Azure resources, you can gain valuable insights into their performance and health. This allows you to proactively identify and troubleshoot issues, ensuring the smooth operation of your applications and services deployed in Azure. Utilize Azure Monitor to set up diagnostics logging and select the appropriate logs, retention period, and destination as per your requirements. Remember, diagnostics logging is a crucial step in maintaining the robustness and reliability of your Azure deployments.