v0.16.136

Changes

filters/diag: add histogram latency filters (#2432)
Add filters that add latency based on the configured histogram.
See https://stats.stackexchange.com/questions/464006/generating-samples-from-a-histogram
Example:

$ bin/skipper -inline-routes='* -> histogramRequestLatency("5ms", 20, "10ms", 30, "15ms", 50, "20ms") -> status(204) -> <shunt>' -access-log-disabled

Latency distribution:

~$ echo "GET http://localhost:9090" | vegeta attack -rate=100/s -duration=20s | vegeta report -type hist[0ms,6ms,11ms,16ms,21ms,26ms]
Bucket         #    %       Histogram
[0s,    6ms]   8    0.40%
[6ms,   11ms]  372  18.60%  #############
[11ms,  16ms]  581  29.05%  #####################
[16ms,  21ms]  964  48.20%  ####################################
[21ms,  26ms]  75   3.75%   ##
[26ms,  +Inf]  0    0.00%

(note that buckets are shifted by 1ms to account for intrinsic latency)

Docker image

Docker image is available in Zalando's Open Source registry:

docker run -it registry.opensource.zalan.do/teapot/skipper:v0.16.136 skipper --help
# arm64
docker run -it registry.opensource.zalan.do/teapot/skipper-arm64:v0.16.136 skipper --help
# arm v7 32bit
docker run -it registry.opensource.zalan.do/teapot/skipper-armv7:v0.16.136 skipper --help