I see these two metrics emitted by istio sidecars, but i am unable to find documentation on what they are.
istio_request_duration_milliseconds_count istio_request_duration_milliseconds_sum
What do these two metrics signify?
Istio metrics - istio_request_duration_milliseconds_count and istio_request_duration_milliseconds_sum
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These are auxilliary metrics exposed by Prometheus-compatible histogram named
istio_request_duration_milliseconds.This histogram tracks the distribution of istio request durations.
The
istio_request_duration_milliseconds_countmetric counts the total number of istio requests since its last start.The
istio_request_duration_milliseconds_summetric tracks the sum of all the request duratioms since the last start of tye istio.These metrics can be used for calculating the average request duration over arbitrary lookbehind window specified in square brackets of the following query:
See more info about this histogram (aka
distribution) in istio docs.