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Azure supports the following kinds of logging in the Websites service:

• System.Diagnostics tracing (you can turn on and off and set levels on the fly without restarting  the site)

• Windows events

• IIS logs (HTTP/FREB)


Azure supports the following kinds of logging in Cloud Services:
• System.Diagnostics tracing

• Performance counters

• Windows events

• IIS logs (HTTP/FREB)

• Custom directory monitoring

The Fix It app uses System.Diagnostics tracing. All you need to do to enable System.Diagnostics logging in an Azure website is flip a switch in the portal or call the REST API. In the portal, click the Configuration tab for your site and scroll down to see the Application Diagnostics section. You can turn logging on or off and select the logging level you want. You can have Azure write the logs to the file system or to a storage account.

Source of Information : Building Cloud Apps With Microsoft Azure