[momothereal]

To be precise it was the other way around. OpenMetrics is a standardization effort for the format Prometheus made up.

However Prometheus was designed before JSON was standardized itself, so I'm just glad they didn't choose XML!

[lokar]

And the Prometheus format is a copy of the "varz" format

[SuperQue]

Sorta, I would say it's an evolution of varz.

IIRC (it's been almost a decade since I used varz), having multiple label values would be a map of maps in varz. It got quite ugly if you wanted to have a number of dimensions.