'Sum counters vector by instance but distinguish per custom label
Consider we have a counters vector with custom label (version). We want to aggregate those by instances, but differentiate by that label to get % approximation in pie chart of versions in live usage. The counters grow by periodic reports from the client app which could report to any of the instances.
# instance 1
app_ver{version="1001"} 5
app_ver{version="1002"} 1
#instance 2
app_ver{version="1001"} 4
app_ver{version="1002"} 2
The following seems to be ok:
sum by (version) (app_ver)
But I can't figure out how to make that work with increase or something similar to get move live approximation for a time range, ie level out users version upgrades and times of inactivities, when there are no reports.
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