prometheus/promql/testdata/functions.test

load 5m
	http_requests{path="/foo"}	1 2 3 0 1 0 0 1 2 0
	http_requests{path="/bar"}	1 2 3 4 5 1 2 3 4 5

eval instant at 50m resets(http_requests[5m])
	{path="/foo"} 0
	{path="/bar"} 0

eval instant at 50m resets(http_requests[20m])
	{path="/foo"} 1
	{path="/bar"} 0

eval instant at 50m resets(http_requests[30m])
	{path="/foo"} 2
	{path="/bar"} 1

eval instant at 50m resets(http_requests[50m])
	{path="/foo"} 3
	{path="/bar"} 1

eval instant at 50m resets(nonexistent_metric[50m])