Metrics documentation

[js8080]

Hello, I am using the Jaeger C# Client and I would like to publicize the metrics gathered by it via Prometheus.

I've written my own IMetricsFactory, ICounter, IGauge, and ITimer classes that essentially wrap corresponding classes in the Prometheus-Net library but I'm having a little trouble with it. For one, I don't understand what the Dictionary<string. string> tags is really representing in the IMetricsFactory.Create* methods, for example:

public ICounter CreateCounter(string name, Dictionary<string, string> tags)

In my debugging, I see tag key:value pairs such as:

state:joined
sampled:y

Should I represent these as labels in my Prometheus metrics?

It'd be nice to have more details in a README.

[yurishkuro]

Yes, tags are "labels" in Prometheus speak.

[Falco20019]

This is the draft that we created some time ago but have not finished:
67ea8dc