get the wrong mistake number when query time is short

[何吉林]

suppose I monitor a job with 100 instance.when I query with 1 minute : 

count(sum(metrics_name{xxx}[1m]) by (instance)),

 

what i get is less than 100.

when I use 10 minutes, 

count(sum(metrics_name{xxx}[10m]) by (instance)),

what i get is 100.

[Brian Candler]

That query cannot even be run - metrics_name{xxx}[1m] is a range vector, but sum() only works over an instant vector.

What's the real query you're doing?

[何吉林]

sorry, the increase function was lost, the whole query should be 

count(sum(increase(metric_name{xxx}[1m])) by (instance) )

在 2020年7月31日星期五 UTC+8下午3:10:47，Brian Candler写道：

[Brian Candler]

What's your scrape interval?

increase(metric_name{xxx}[1m])

requires at least two data points in the 1m window.  So if you are scraping at 1m intervals, you need at least [2m] to guarantee two data points in the window at any time.