Prometheus Instrumentation

[onelapahead]

Similar to hyperledger/firefly#189, it'd be great if DX had Prometheus metrics for API call count and durations, messages sent and message request durations, errors / retries, etc.

We can leverage https://github.com/siimon/prom-client to get some basic metrics added quickly and then build from there.

[trinadh61]

hi @onelapahead
i would like to pick this issue if it is not done

[EnriqueL8]

@trinadh61 go for it!