load 5m
  http_requests{job="api-server", instance="0", group="production"} 0+10x10
  http_requests{job="api-server", instance="1", group="production"} 0+20x10
  http_requests{job="api-server", instance="0", group="canary"}   0+30x10
  http_requests{job="api-server", instance="1", group="canary"}   0+40x10
  http_requests{job="app-server", instance="0", group="production"} 0+50x10
  http_requests{job="app-server", instance="1", group="production"} 0+60x10
  http_requests{job="app-server", instance="0", group="canary"}   0+70x10
  http_requests{job="app-server", instance="1", group="canary"}   0+80x10

# Simple sum.
eval instant at 50m SUM BY (group) (http_requests{job="api-server"})
  {group="canary"} 700
  {group="production"} 300

# Test alternative "by"-clause order.
eval instant at 50m sum by (group) (http_requests{job="api-server"})
  {group="canary"} 700
  {group="production"} 300

# Simple average.
eval instant at 50m avg by (group) (http_requests{job="api-server"})
  {group="canary"} 350
  {group="production"} 150

# Simple count.
eval instant at 50m count by (group) (http_requests{job="api-server"})
  {group="canary"} 2
  {group="production"} 2

# Lower-cased aggregation operators should work too.
eval instant at 50m sum(http_requests) by (job) + min(http_requests) by (job) + max(http_requests) by (job) + avg(http_requests) by (job)
  {job="app-server"} 4550
  {job="api-server"} 1750

# Test alternative "by"-clause order with "keep_common".
eval instant at 50m sum by (group) keep_common (http_requests{job="api-server"})
  {group="canary", job="api-server"} 700
  {group="production", job="api-server"} 300

# Test both alternative "by"-clause orders in one expression.
# Public health warning: stick to one form within an expression (or even
# in an organization), or risk serious user confusion.
eval instant at 50m sum(sum by (group) keep_common (http_requests{job="api-server"})) by (job)
  {job="api-server"} 1000


# Standard deviation and variance.
eval instant at 50m stddev(http_requests)
  {} 229.12878474779

eval instant at 50m stddev by (instance)(http_requests)
  {instance="0"} 223.60679774998
  {instance="1"} 223.60679774998

eval instant at 50m stdvar(http_requests)
  {} 52500

eval instant at 50m stdvar by (instance)(http_requests)
  {instance="0"} 50000
  {instance="1"} 50000


# Regression test for missing separator byte in labelsToGroupingKey.
clear
load 5m
  label_grouping_test{a="aa", b="bb"} 0+10x10
  label_grouping_test{a="a", b="abb"} 0+20x10

eval instant at 50m sum(label_grouping_test) by (a, b)
  {a="a", b="abb"} 200
  {a="aa", b="bb"} 100


# Tests for min/max.
clear
load 5m
  http_requests{job="api-server", instance="0", group="production"}	1
  http_requests{job="api-server", instance="1", group="production"}	2
  http_requests{job="api-server", instance="0", group="canary"}		NaN
  http_requests{job="api-server", instance="1", group="canary"}		3
  http_requests{job="api-server", instance="2", group="canary"}		4

eval instant at 0m max(http_requests)
  {} 4

eval instant at 0m min(http_requests)
  {} 1

eval instant at 0m max by (group) (http_requests)
  {group="production"} 2
  {group="canary"} 4

eval instant at 0m min by (group) (http_requests)
  {group="production"} 1
  {group="canary"} 3