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  • AKIHITO INOH thinks this is interesting:

Prometheus only supports 64-bit floating points numbers as time series values, not any other data types such as strings. Label values are however strings, and there are certain limited use cases where it is okay to (ab)use them without getting too far into logs-based monitoring.

From

Cover of Prometheus: Up & Running

Note

値は64ビットの浮動小数点しか無い、一方でラベルは文字列型。そのため、ロギングのシステムをを使わないでPrometheusの世界で使うパターンがいくつか存在する。