Commits on Jul 5, 2022

1. admissionControl is a load shedding filter, that works by observing b… …

   …ackend errors
   
       admissionControl(metricsSuffix, mode, d, windowSize, minRPS, successThreshold, maxRejectProbability, exponent)
       admissionControl("myapp", "active", "1s", 5, 10, 0.9, 0.95, 2.0)
   
   metricSuffix is the suffix key to expose reject counter, should be unique by filter instance
   mode is one of "active", "inactive", "log"
   windowSize is within [minWindowSize, maxWindowSize]
   minRPS
   successThreshold is within (0,1] and sets the lowest request success rate at which the filter will not reject requests.
   maxRejectProbability is within (0,1] and sets the upper bound of reject probability.
   exponent >0, 1: linear, 1/2: qudratic, ..
   
   see also https://opensource.zalando.com/skipper/reference/filters/#admissioncontrol
   
   safety: handles background goroutine close on update and delete
   feature: add preprocessor to remove filter duplicates, last wins
   
   Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

   

   szuecs committed Jul 5, 2022
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2. cleanup: remove duplicates and last wins …

   cleanup: deleting a filter will close that filter
   
   Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

   

   szuecs committed Jul 5, 2022
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