Librato is a cloud monitoring platform designed for developers and operations professionals to monitor and analyze metrics across various levels of the technology stack, providing tools for real-time data stream analysis and visualization on dynamic dashboards. The platform's new feature, the Librato block, enables users to gather, process, and visualize metrics, such as tracking user activity in large-scale applications, which can alert relevant teams when certain error thresholds are met. The article explains how to implement custom metrics tracking in a real-time AngularJS web application using Librato's API and PubNub's JavaScript SDK, highlighting the importance of technical and business metrics for maintaining service continuity and rapid issue resolution. The article also provides a step-by-step guide on setting up a serverless code block using PubNub and integrating it with Librato for efficient metrics collection and visualization, emphasizing the ease of use and minimal code requirements for building a real-time monitoring UI.