@lilic's PR inspired me to look at our examples, and we might improve those a bit 🤗

I am missing examples around:

• Defining basic metric types (and vectors). Only Histogram and Summary and collectors are there.
• Some summaries could be replaced by native histograms e.g.

  client_golang/examples/random/main.go

  Line 43 in b804be1

  rpcDurations: prometheus.NewSummaryVec(

• Testing instrumentation

Help wanted!