<ul><li>The rate() function in Prometheus calculates the average per-second increase of a counter over a specified time range.</li><li>It is used to determine how fast a value, such as a counter, is increasing every second, averaged over the designated time window.</li><li>rate() works exclusively on counters, providing an instant vector with one data point per series for the current evaluation time. It is beneficial for alerting and visualizations, especially for slow-moving metrics.</li><li>When using rate(), always apply it before aggregators like sum() or avg(), limit its use to counters and histograms, and consider using it for alerting thresholds.</li></ul>

Prometheus rate() Function: Measuring How Fast Your Metrics Are Growing

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