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app/vmselect/promql: add prometheus_buckets function for converting the upcoming histogram buckets from github.com/VictoriaMetrics/metrics to Prometheus-compatible buckets

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This commit is contained in:
Aliaksandr Valialkin 2019-11-23 00:10:01 +02:00
parent 17d08c1fe0
commit 5f6f03c692
2 changed files with 199 additions and 0 deletions
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137
app/vmselect/promql/exec_test.go
View File

@ -2417,6 +2417,143 @@ func TestExecSuccess(t *testing.T) {
resultExpected := []netstorage.Result{}
f(q, resultExpected)
})
t.Run(`prometheus_buckets(missing-vmrange)`, func(t *testing.T) {
t.Parallel()
q := `sort(prometheus_buckets((
alias(label_set(90, "foo", "bar", "le", "0"), "xxx"),
alias(label_set(time()/20, "foo", "bar", "le", "0.2"), "xxx"),
alias(label_set(time()/100, "foo", "bar", "vmrange", "foobar"), "xxx"),
alias(label_set(time()/100, "foo", "bar", "vmrange", "30...foobar"), "xxx"),
alias(label_set(time()/100, "foo", "bar", "vmrange", "30...40"), "xxx"),
alias(label_set(time()/40, "foo", "bar", "vmrange", "900...1000", "le", "2343"), "yyy"),
alias(label_set(time()/10, "foo", "bar", "vmrange", "1000...Inf", "le", "2343"), "yyy"),
)))`
r1 := netstorage.Result{
MetricName: metricNameExpected,
Values: []float64{10, 12, 14, 16, 18, 20},
Timestamps: timestampsExpected,
}
r1.MetricName.MetricGroup = []byte("xxx")
r1.MetricName.Tags = []storage.Tag{
{
Key: []byte("foo"),
Value: []byte("bar"),
},
{
Key: []byte("le"),
Value: []byte("40"),
},
}
r2 := netstorage.Result{
MetricName: metricNameExpected,
Values: []float64{25, 30, 35, 40, 45, 50},
Timestamps: timestampsExpected,
}
r2.MetricName.MetricGroup = []byte("yyy")
r2.MetricName.Tags = []storage.Tag{
{
Key: []byte("foo"),
Value: []byte("bar"),
},
{
Key: []byte("le"),
Value: []byte("1000"),
},
}
r3 := netstorage.Result{
MetricName: metricNameExpected,
Values: []float64{125, 150, 175, 200, 225, 250},
Timestamps: timestampsExpected,
}
r3.MetricName.MetricGroup = []byte("yyy")
r3.MetricName.Tags = []storage.Tag{
{
Key: []byte("foo"),
Value: []byte("bar"),
},
{
Key: []byte("le"),
Value: []byte("Inf"),
},
}
resultExpected := []netstorage.Result{r1, r2, r3}
f(q, resultExpected)
})
t.Run(`prometheus_buckets(valid)`, func(t *testing.T) {
t.Parallel()
q := `sort(prometheus_buckets((
alias(label_set(90, "foo", "bar", "vmrange", "0...0"), "xxx"),
alias(label_set(time()/20, "foo", "bar", "vmrange", "0.1...0.2"), "xxx"),
alias(label_set(time()/100, "foo", "bar", "vmrange", "30...40"), "xxx"),
alias(label_set(time()/10, "foo", "bar", "vmrange", "1000...Inf"), "xxx"),
)))`
r1 := netstorage.Result{
MetricName: metricNameExpected,
Values: []float64{90, 90, 90, 90, 90, 90},
Timestamps: timestampsExpected,
}
r1.MetricName.MetricGroup = []byte("xxx")
r1.MetricName.Tags = []storage.Tag{
{
Key: []byte("foo"),
Value: []byte("bar"),
},
{
Key: []byte("le"),
Value: []byte("0"),
},
}
r2 := netstorage.Result{
MetricName: metricNameExpected,
Values: []float64{140, 150, 160, 170, 180, 190},
Timestamps: timestampsExpected,
}
r2.MetricName.MetricGroup = []byte("xxx")
r2.MetricName.Tags = []storage.Tag{
{
Key: []byte("foo"),
Value: []byte("bar"),
},
{
Key: []byte("le"),
Value: []byte("0.2"),
},
}
r3 := netstorage.Result{
MetricName: metricNameExpected,
Values: []float64{150, 162, 174, 186, 198, 210},
Timestamps: timestampsExpected,
}
r3.MetricName.MetricGroup = []byte("xxx")
r3.MetricName.Tags = []storage.Tag{
{
Key: []byte("foo"),
Value: []byte("bar"),
},
{
Key: []byte("le"),
Value: []byte("40"),
},
}
r4 := netstorage.Result{
MetricName: metricNameExpected,
Values: []float64{250, 282, 314, 346, 378, 410},
Timestamps: timestampsExpected,
}
r4.MetricName.MetricGroup = []byte("xxx")
r4.MetricName.Tags = []storage.Tag{
{
Key: []byte("foo"),
Value: []byte("bar"),
},
{
Key: []byte("le"),
Value: []byte("Inf"),
},
}
resultExpected := []netstorage.Result{r1, r2, r3, r4}
f(q, resultExpected)
})
t.Run(`median_over_time()`, func(t *testing.T) {
t.Parallel()
q := `median_over_time({})`

62
app/vmselect/promql/transform.go
View File

@ -91,6 +91,7 @@ var transformFuncs = map[string]transformFunc{
"cos": newTransformFuncOneArg(transformCos),
"asin": newTransformFuncOneArg(transformAsin),
"acos": newTransformFuncOneArg(transformAcos),
"prometheus_buckets": transformPrometheusBuckets,
}
func getTransformFunc(s string) transformFunc {
@ -272,6 +273,67 @@ func transformFloor(v float64) float64 {
return math.Floor(v)
}
func transformPrometheusBuckets(tfa *transformFuncArg) ([]*timeseries, error) {
args := tfa.args
if err := expectTransformArgsNum(args, 1); err != nil {
return nil, err
}
// Group timeseries by MetricGroup+tags excluding `vmrange` tag.
type x struct {
leStr string
le float64
ts *timeseries
}
m := make(map[string][]x)
bb := bbPool.Get()
defer bbPool.Put(bb)
for _, ts := range args[0] {
vmrange := ts.MetricName.GetTagValue("vmrange")
if len(vmrange) == 0 {
continue
}
n := strings.Index(bytesutil.ToUnsafeString(vmrange), "...")
if n < 0 {
continue
}
leStr := string(vmrange[n+len("..."):])
le, err := strconv.ParseFloat(leStr, 64)
if err != nil {
continue
}
ts.MetricName.RemoveTag("vmrange")
bb.B = marshalMetricNameSorted(bb.B[:0], &ts.MetricName)
m[string(bb.B)] = append(m[string(bb.B)], x{
leStr: leStr,
le: le,
ts: ts,
})
}
rvs := make([]*timeseries, 0, len(args[0]))
for _, xss := range m {
sort.Slice(xss, func(i, j int) bool { return xss[i].le < xss[j].le })
for i := range xss[0].ts.Values {
count := float64(0)
for _, xs := range xss {
ts := xs.ts
v := ts.Values[i]
if !math.IsNaN(v) {
count += v
}
ts.MetricName.RemoveTag("le")
ts.MetricName.AddTag("le", xs.leStr)
ts.Values[i] = count
}
}
for i := range xss {
rvs = append(rvs, xss[i].ts)
}
}
return rvs, nil
}
func transformHistogramQuantile(tfa *transformFuncArg) ([]*timeseries, error) {
args := tfa.args
if err := expectTransformArgsNum(args, 2); err != nil {