# Histogram

Histograms track the distribution of observed values. A histogram samples observations (request durations, response sizes, and so on) and counts them in configurable buckets. It also provides a sum of all observed values.

Histogram is one of the metric types supported by Kloudfuse. It is more complex compared to [counter](https://docs.kloudfuse.com/platform/3.2.5/counter/) and [gauge](https://docs.kloudfuse.com/platform/3.2.5/gauge/).

Use histograms for any calculated values counted based on bucket values, such as the time it takes to reply to a request, called latency.

Developers can configure bucket boundaries.

See the [functions](https://docs.kloudfuse.com/platform/3.2.5/metrics-functions/) you can use with histogram metrics.