Hi RT,
If your Azure Function monitoring is not working or displaying correctly, check your function app configuration. Ensure the correct Application Insights settings, including the instrumentation key or connection string. Also, verify the sampling settings, as misconfigurations can lead to missing or partial logs.
For troubleshooting, go to your function app in the Azure portal, select "Diagnose and solve problems", and run "Function Configuration Checks".
For your reference, please review the following documentations for further clarification:
I hope this addresses your query. Please let me know if you need any further assistance or clarification.