Hello

In https://prometheus.io/docs/instrumenting/writing_clientlibs/ under the 
section "Labels" it says 

"Client libraries MUST NOT under any circumstances allow users to have 
different label names for the same metric for 
Gauge/Counter/Summary/Histogram or any other Collector offered by the 
library."

Does anyone know the background behind this rule? My understanding is that 
Prometheus' data model is that a metrics is uniquely identified by metric 
name and set of labels, so technically it should be possible to 
have metrics that has the same name but different set of label names. Is 
the rule to enforce best practice? 

Cheers, 
Alvin 

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