<ul><li>Prometheus uses Gauge as a metric type to represent a single numerical value that can fluctuate.</li><li>Gauge is used to track current values that can go up or down such as memory, CPU usage, and queue size.</li><li>In Java with Prometheus client library, Gauges are defined and updated based on logic like setting, increasing, or decreasing values.</li><li>An example Java application with Gauge metric for active users count is provided, demonstrating how to use Gauges to monitor and expose metrics.</li></ul>

How to expose Gauge metric using Prometheus Java Client?

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