I described in detailed the problem 
in https://github.com/prometheus/prometheus/issues/8001 (which was closed 
but see details there)

In short the default install from helm has 1 minute scrape which makes the 
istio and kiali dashboards "empty" because they use [1m] in the query

Given a 1m scrape means the data is on average 30s old, I don't think 
returning "no data" for queries is a very useful behavior, even if I was 
scraping every 10 minutes I expect that any resolution I ask would be 
extrapolated - but I guess I have the wrong expectations?

Can someone talk me through why "no data" is the right answer for [1m] 
while there is data for [90s]

sample query:
sum(rate(istio_tcp_received_bytes_total{reporter="source"}[90s])) by 
(destination_workload, destination_workload_namespace, destination_service)

Thanks a lot
Laurent

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