I have an api application hosted on azure App services. For the web server log (iis logs) I\'ve turned on web server logging from Azure portal. Look at the screenshot below.
Verified with App Services team that Log Analytics is only supported at the IaaS (VM) level, not at PaaS (App Service) level.
Hopefully we can get this on their roadmap soon - for now you have to manually ingest this data into an external log management tool (Splunk, Sumo Logic, Azure Data Explorer).
Azure App Service has announced a Public Preview for IIS App Log integration with Azure Log Analytics.