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The Grafana Heatmap panel is best suited for visualizing histogram metrics collected from Prometheus. Histograms provide bucketed data distributions (e.g., request durations, response sizes), and the heatmap effectively displays these as a two-dimensional density chart over time. In Prometheus, histogram metrics are exposed as multiple time series with the _bucket suffix and the label le (less than or equal). Grafana interprets these buckets to create visual bands showing how frequently different value ranges occurred. Counters, gauges, and info metrics do not have bucketed distributions, so a heatmap would not produce meaningful output for them. Reference: Verified from Grafana documentation - Heatmap Panel Overview, Visualizing Prometheus Histograms, and Prometheus documentation - Understanding Histogram Buckets.
