Hands-On Infrastructure Monitoring with Prometheus

Info and enum

There are two metric types yet to be mentioned, info and enum. They are quite recent, but the convenience they bring is very much appreciated. Metrics of the type info have their names end with _info and are regular gauges with one possible value, 1. This special kind of metric was designed to be a place where labels whose values might change over time are stored, such as versions (for example, exporter version, language version, and kernel version), assigned roles, or VM metadata information; if those labels were to be exported in every time series, were they to change, a break in continuity would happen as the metric identity (the combination of the metric name and label set) would also change. This would also pollute the ...