Prometheus and OpenMetrics strongly recommend that the units for measuring durations should be seconds. However, the semantic conventions here are in milliseconds.

This creates a lot of confusion in users who are expecting durations to be seconds and requires an addition / 1e3 when doing math with metrics that come from traditional Prometheus sources. For example, today Kubernetes metrics are all in _seconds mainly because of the Prometheus conventions. This would be similar for other existing systems as well.

Given its all floats, I think we should try and revist the decision to use milliseconds and try to align with Prometheus.