Add incoming HTTP service metrics to LabKit

Andrew Newdigaterequested to merge
metrics into master

This changes adds standardised prometheus metrics middlewares to LabKit.

The middleware will expose the following metrics:

  • in_flight_requests
  • requests_total
  • request_duration_seconds
  • request_size_bytes
  • response_size_bytes
  • time_to_write_header_seconds
Edited by Andrew Newdigate

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