This article helps you to understand what to monitor if you have a Node.js application in production, and how to use Prometheus – an open source solution, which provides powerful data compressions and fast data querying for time series data – for Node.js monitoring.
New Relic Browser uses a JavaScript snippet (or "agent") to instrument your app's webpages. The JavaScript collects data for browser monitoring. To install the New Relic Browser agent, you can choose from a number of deployment options.