In this unit, we look at how app logging can help with your Web apps, and show you how to enable app logs.
What are app logs?
Azure provides built-in diagnostics with app logging. App logs are the output of runtime trace statements in app code. For example, you might want to check some logic in your code by adding a trace to show when a particular function is being processed. Or, you might only want to see a logged message when a particular level of error occurs. App logging is primarily for apps in preproduction and for troublesome issues, because excessive logs can carry a performance hit and quickly consume storage. For this reason, logging to the file system is automatically disabled after 12 hours.
App logging has scale limitations, primarily because files are being used to save the logged output. If you have multiple instances of an app, and the same storage is shared across all instances, messages from different instances might be interleaved, making troubleshooting difficult. If each instance has its own log file, then there are multiple logs, again making it difficult to troubleshoot instance-specific issues.
The types of logging available through the Azure App Service depends on the code framework of the app, and on whether the app is running on a Windows or Linux app host.
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