* Higher resolution forwarding latency histogram.
Was using the average latency/jitter of last second to populate
forwarding latency/jitter histogram. But, it is too coarse, i. e. the
average value of latency/jitter is very low and those summarised samples
end up in the lowest bucket always.
A few things to address it
- record per packet forwarding latency in histogram
- adjust histogram bins to include smaller values
- Drop jitter histogram
This is a per packet call, but prometheus histogram is supposedly
fast/light weight. Would be good to get better resolution histograms.
Hence doing this. Please let me know if there are performance concerns.
* typo
* one more typo
4ce07bedeb