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app/vmselect/promql: add scrape_interval(q[d]) function, which would return scrape interval for q over d

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This commit is contained in:
Aliaksandr Valialkin 2019-08-18 21:07:59 +03:00
parent 218cb4623a
commit 005aabd305
2 changed files with 46 additions and 0 deletions
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18
app/vmselect/promql/rollup.go
View File

@ -46,6 +46,7 @@ var rollupFuncs = map[string]newRollupFunc{
"integrate": newRollupFuncOneArg(rollupIntegrate),
"ideriv": newRollupFuncOneArg(rollupIderiv),
"lifetime": newRollupFuncOneArg(rollupLifetime),
"scrape_interval": newRollupFuncOneArg(rollupScrapeInterval),
"rollup": newRollupFuncOneArg(rollupFake),
"rollup_rate": newRollupFuncOneArg(rollupFake), // + rollupFuncsRemoveCounterResets
"rollup_deriv": newRollupFuncOneArg(rollupFake),
@ -62,6 +63,8 @@ var rollupFuncsMayAdjustWindow = map[string]bool{
"deriv_fast": true,
"irate": true,
"rate": true,
"lifetime": true,
"scrape_interval": true,
}
var rollupFuncsRemoveCounterResets = map[string]bool{
@ -741,6 +744,21 @@ func rollupLifetime(rfa *rollupFuncArg) float64 {
return float64(timestamps[len(timestamps)-1]-rfa.prevTimestamp) * 1e-3
}
func rollupScrapeInterval(rfa *rollupFuncArg) float64 {
// Calculate the average interval between data points.
timestamps := rfa.timestamps
if math.IsNaN(rfa.prevValue) {
if len(timestamps) < 2 {
return nan
}
return float64(timestamps[len(timestamps)-1]-timestamps[0]) * 1e-3 / float64(len(timestamps)-1)
}
if len(timestamps) == 0 {
return nan
}
return (float64(timestamps[len(timestamps)-1]-rfa.prevTimestamp) * 1e-3) / float64(len(timestamps))
}
func rollupChanges(rfa *rollupFuncArg) float64 {
// There is no need in handling NaNs here, since they must be cleaned up
// before calling rollup funcs.

28
app/vmselect/promql/rollup_test.go
View File

@ -612,6 +612,34 @@ func TestRollupFuncsNoWindow(t *testing.T) {
timestampsExpected := []int64{0, 40, 80, 120, 160}
testRowsEqual(t, values, rc.Timestamps, valuesExpected, timestampsExpected)
})
t.Run("scrape_interval", func(t *testing.T) {
rc := rollupConfig{
Func: rollupScrapeInterval,
Start: 0,
End: 160,
Step: 40,
Window: 0,
}
rc.Timestamps = getTimestamps(rc.Start, rc.End, rc.Step)
values := rc.Do(nil, testValues, testTimestamps)
valuesExpected := []float64{nan, 0.010333333333333333, 0.011, 0.013333333333333334, 0.01}
timestampsExpected := []int64{0, 40, 80, 120, 160}
testRowsEqual(t, values, rc.Timestamps, valuesExpected, timestampsExpected)
})
t.Run("scrape_interval", func(t *testing.T) {
rc := rollupConfig{
Func: rollupScrapeInterval,
Start: 0,
End: 160,
Step: 40,
Window: 80,
}
rc.Timestamps = getTimestamps(rc.Start, rc.End, rc.Step)
values := rc.Do(nil, testValues, testTimestamps)
valuesExpected := []float64{nan, 0.010333333333333333, 0.010714285714285714, 0.012, 0.0125}
timestampsExpected := []int64{0, 40, 80, 120, 160}
testRowsEqual(t, values, rc.Timestamps, valuesExpected, timestampsExpected)
})
t.Run("changes", func(t *testing.T) {
rc := rollupConfig{
Func: rollupChanges,