The author talks about Graphite and Prometheus as instrumentation systems but they&#x27;re for collecting data. What do people recommend as a linkable library for collecting metrics in the service process? (before it is collected).  A quick google gave me &#x27;go-metrics&#x27; and &#x27;dropwizard metrics&#x27; but the code I&#x27;m working on will require linking with a native C library.