Currently Nighthawk does not flush statistics and metrics in real time during its run. We plan to add the functionality to flush Nighthawk metrics periodically (at a configured time interval) to Envoy stats Sinks following the example of what has been done in Envoy.

We also plan to add new counters and histograms to monitor
number of total requests sent (counter)
request latency (histogram)
request/response header/body size (histogram)
number of total requests blocked (counter)

/cc @mum4k