The document discusses New Relic Synthetics, a tool for monitoring client-side applications using containers. It can run tests behind a firewall from any cloud location using a containerized approach. The tests are powered by an automation environment that includes Selenium and Chrome. All test data is captured and available in Insights with no observation variability. Deploying the Docker image is easy with a single command and upgrades involve stopping, pulling, and starting the Docker container. There is a demonstration of New Relic Synthetics and takeaways on how it allows for successful synthetic monitoring of internal applications from any location with an easy process and lossless data collection.