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