Flink Histograms are exposed as Summaries
<https://prometheus.io/docs/concepts/metric_types/#summary>, since the
quantiles are computed on the client-side (i.e., Flink side)
Flink Histograms cannot provide _sum data because we simply do not
compute it, IIRC because Dropwizard Histograms also don't compute a sum
and they are the only implementations to exist.
On 1/13/2021 4:24 PM, Manish G wrote:
So I an following this link
<https://prometheus.io/docs/practices/histograms/> too, to calculate
average request duration. As per this page, histogram metrics has
_count, _sum data. Though it is prometheus histogram, I expected flink
histogram too would provide me same.
On Wed, Jan 13, 2021 at 8:50 PM Chesnay Schepler <ches...@apache.org
<mailto:ches...@apache.org>> wrote:
What exactly do you mean with "count metrics" and "sum"?
Given a Histogram H, you should see:
- one time series named <scope>H_count
- one time series named <scope>H, with various labels for the
different quantiles.
What do you see in Prometheus, and what do you consider to be missing?
On 1/13/2021 4:10 PM, Manish G wrote:
Hi All,
I have added histogram to code following here
<https://ci.apache.org/projects/flink/flink-docs-stable/ops/metrics.html#histogram>.
But I observe that on prometheus board I get only count metrics,
not sum. Metrics itself is missing.
I have used classes:
com.codahale.metrics.Histogram
org.apache.flink.dropwizard.metrics.DropwizardHistogramWrapper
What do I miss here?
