Hey everyone,
I'm failry new to prometheus and trying to wrap my head around some
concepts which are not really clear to me.
I'm running a Scala-Application with the official Prometheus Java client.
I'm trying to measure the performance of http endpoints and use a `Summary`
for that. I implemented an endpoint where I serve the Metrics via an
internal andpoint by taking the `TextFormat.write004` method and serving it
by myself (not via the included HTTPServlet).
I've setup a Prometheus instance querying that endpoint every 15s and set
the maxAge of the Summary also to 15s. Now I have a PromQL-Query like this:
`sum
by(route)(requests_latency_seconds_sum/requests_latency_seconds_count)*1000`,
which should give me the average response-time of an endpoint in
milliseconds for each scrape-interval
When rendering the data though, I get some kind of weirdly aggregated data
points which is probably a mixture of bad settings and misunderstanding.
Take this metric for example:
```
requests_latency_seconds_count{route="library.get",} 83.0
requests_latency_seconds_sum{route="library.get",} 949.2774687769999
```
This summary does not reset after 15s, instead it keeps accumulating all
the data which makes it useless to pin-point timebased anomalies in my
application.
I digged into the sourcecode of the java library and did not find a way to
reset the values to zero or remove them after scraping them. Is this
intentionally? Did I miss something in my configuration? Also, as I
understood it, the summary is supposed to reset itself?
Hope someone can give me some hints how to solve this
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