What is the purpose of the 'custom.properties' file?

The 'custom.properties' file is primarily used to add a proxy for private synthetic monitoring. This functionality is critical for environments that require web application monitoring through synthetic transactions, especially when the applications are hosted in private networks. By defining the proxy settings in the 'custom.properties' file, Dynatrace enables seamless access to the monitored applications from Synthetic Monitoring agents that may be located outside the private network.

This capability allows the synthetic monitors to function effectively by routing their requests through the specified proxy, ensuring they can accurately simulate user interactions and provide visibility into performance metrics, availability, and other important aspects of the application's behavior. As a result, this setting is essential for maintaining robust monitoring practices within private or restricted environments.