load 10s
  metric 0 1 stale 2

# Instant vector doesn't return series when stale.
eval instant at 10s metric
  {__name__="metric"} 1

eval instant at 20s metric

eval instant at 30s metric
  {__name__="metric"} 2

eval instant at 40s metric
  {__name__="metric"} 2

# It goes stale 4 intervals + 10% after the last sample.
eval instant at 71s metric
  {__name__="metric"} 2

eval instant at 72s metric


# Range vector ignores stale sample.
eval instant at 30s count_over_time(metric[1m])
  {} 3

eval instant at 10s count_over_time(metric[1s])
  {} 1

eval instant at 20s count_over_time(metric[1s])

eval instant at 20s count_over_time(metric[10s])
  {} 1


clear

load 10s
  metric 0

# Series with single point goes stale after 5 minutes.
eval instant at 0s metric
  {__name__="metric"} 0

eval instant at 150s metric
  {__name__="metric"} 0

eval instant at 300s metric
  {__name__="metric"} 0

eval instant at 301s metric