Which of the following is a supported technology out of the box in Dynatrace?

In Dynatrace, out-of-the-box support means that the technology can be monitored without requiring additional plugins or custom configurations. Varnish Cache is recognized as one of those technologies that Dynatrace supports natively. This includes capabilities such as gathering performance metrics, analyzing traffic patterns, and providing insights into caching behavior.

Dynatrace's out-of-the-box support for Varnish Cache allows users to easily integrate and start monitoring their Varnish instances right away, enabling organizations to optimize their caching strategies and enhance application performance.

While MySQL and MongoDB are also supported technologies in Dynatrace, along with Redis, Varnish Cache specifically stands out as having comprehensive native integration that users can leverage immediately within their Dynatrace environment. This makes it particularly valuable for users relying on caching solutions to improve their web performance.