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Add abs() and over-time aggregation functions.

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This implements aggregation functions over time as request in
https://github.com/prometheus/prometheus/issues/383.

Change-Id: Ifd69b850de8cfdf6e7a6c0e042056fa4c672410e
This commit is contained in:
Julius Volz 2014-07-28 16:12:58 +02:00
parent ed3291fd8b
commit 527831ec6e
2 changed files with 172 additions and 1 deletions
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117
rules/ast/functions.go
View file

@ -21,6 +21,7 @@ import (
clientmodel "github.com/prometheus/client_golang/model"
"github.com/prometheus/prometheus/storage/metric"
"github.com/prometheus/prometheus/utility"
)
@ -275,7 +276,105 @@ func countScalarImpl(timestamp clientmodel.Timestamp, view *viewAdapter, args []
return clientmodel.SampleValue(len(args[0].(VectorNode).Eval(timestamp, view)))
}
func aggrOverTime(timestamp clientmodel.Timestamp, view *viewAdapter, args []Node, aggrFn func(metric.Values) clientmodel.SampleValue) interface{} {
n := args[0].(MatrixNode)
matrixVal := n.Eval(timestamp, view)
resultVector := Vector{}
for _, el := range matrixVal {
if len(el.Values) == 0 {
continue
}
resultVector = append(resultVector, &clientmodel.Sample{
Metric: el.Metric,
Value: aggrFn(el.Values),
Timestamp: timestamp,
})
}
return resultVector
}
// === avg_over_time(matrix MatrixNode) Vector ===
func avgOverTimeImpl(timestamp clientmodel.Timestamp, view *viewAdapter, args []Node) interface{} {
return aggrOverTime(timestamp, view, args, func(values metric.Values) clientmodel.SampleValue {
var sum clientmodel.SampleValue
for _, v := range values {
sum += v.Value
}
return sum / clientmodel.SampleValue(len(values))
})
}
// === count_over_time(matrix MatrixNode) Vector ===
func countOverTimeImpl(timestamp clientmodel.Timestamp, view *viewAdapter, args []Node) interface{} {
return aggrOverTime(timestamp, view, args, func(values metric.Values) clientmodel.SampleValue {
return clientmodel.SampleValue(len(values))
})
}
// === max_over_time(matrix MatrixNode) Vector ===
func maxOverTimeImpl(timestamp clientmodel.Timestamp, view *viewAdapter, args []Node) interface{} {
return aggrOverTime(timestamp, view, args, func(values metric.Values) clientmodel.SampleValue {
max := math.Inf(-1)
for _, v := range values {
max = math.Max(max, float64(v.Value))
}
return clientmodel.SampleValue(max)
})
}
// === min_over_time(matrix MatrixNode) Vector ===
func minOverTimeImpl(timestamp clientmodel.Timestamp, view *viewAdapter, args []Node) interface{} {
return aggrOverTime(timestamp, view, args, func(values metric.Values) clientmodel.SampleValue {
min := math.Inf(1)
for _, v := range values {
min = math.Min(min, float64(v.Value))
}
return clientmodel.SampleValue(min)
})
}
// === sum_over_time(matrix MatrixNode) Vector ===
func sumOverTimeImpl(timestamp clientmodel.Timestamp, view *viewAdapter, args []Node) interface{} {
return aggrOverTime(timestamp, view, args, func(values metric.Values) clientmodel.SampleValue {
var sum clientmodel.SampleValue
for _, v := range values {
sum += v.Value
}
return sum
})
}
// === abs(vector VectorNode) Vector ===
func absImpl(timestamp clientmodel.Timestamp, view *viewAdapter, args []Node) interface{} {
n := args[0].(VectorNode)
vector := n.Eval(timestamp, view)
for _, el := range vector {
el.Value = clientmodel.SampleValue(math.Abs(float64(el.Value)))
}
return vector
}
var functions = map[string]*Function{
"abs": {
name: "abs",
argTypes: []ExprType{VECTOR},
returnType: VECTOR,
callFn: absImpl,
},
"avg_over_time": {
name: "avg_over_time",
argTypes: []ExprType{MATRIX},
returnType: VECTOR,
callFn: avgOverTimeImpl,
},
"count_over_time": {
name: "count_over_time",
argTypes: []ExprType{MATRIX},
returnType: VECTOR,
callFn: countOverTimeImpl,
},
"count_scalar": {
name: "count_scalar",
argTypes: []ExprType{VECTOR},
@ -288,6 +387,18 @@ var functions = map[string]*Function{
returnType: VECTOR,
callFn: deltaImpl,
},
"max_over_time": {
name: "max_over_time",
argTypes: []ExprType{MATRIX},
returnType: VECTOR,
callFn: maxOverTimeImpl,
},
"min_over_time": {
name: "min_over_time",
argTypes: []ExprType{MATRIX},
returnType: VECTOR,
callFn: minOverTimeImpl,
},
"rate": {
name: "rate",
argTypes: []ExprType{MATRIX},
@ -318,6 +429,12 @@ var functions = map[string]*Function{
returnType: VECTOR,
callFn: sortDescImpl,
},
"sum_over_time": {
name: "sum_over_time",
argTypes: []ExprType{MATRIX},
returnType: VECTOR,
callFn: sumOverTimeImpl,
},
"time": {
name: "time",
argTypes: []ExprType{},

56
rules/rules_test.go
View file

@ -436,12 +436,66 @@ func TestExpressions(t *testing.T) {
}, {
expr: `http_requests{group="production",job=~"^api"}`,
output: []string{
`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
},
fullRanges: 0,
intervalRanges: 2,
},
{
expr: `abs(-1 * http_requests{group="production",job="api-server"})`,
output: []string{
`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
},
fullRanges: 0,
intervalRanges: 2,
},
{
expr: `avg_over_time(http_requests{group="production",job="api-server"}[1h])`,
output: []string{
`http_requests{group="production", instance="0", job="api-server"} => 50 @[%v]`,
`http_requests{group="production", instance="1", job="api-server"} => 100 @[%v]`,
},
fullRanges: 2,
intervalRanges: 0,
},
{
expr: `count_over_time(http_requests{group="production",job="api-server"}[1h])`,
output: []string{
`http_requests{group="production", instance="0", job="api-server"} => 11 @[%v]`,
`http_requests{group="production", instance="1", job="api-server"} => 11 @[%v]`,
},
fullRanges: 2,
intervalRanges: 0,
},
{
expr: `max_over_time(http_requests{group="production",job="api-server"}[1h])`,
output: []string{
`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
},
fullRanges: 2,
intervalRanges: 0,
},
{
expr: `min_over_time(http_requests{group="production",job="api-server"}[1h])`,
output: []string{
`http_requests{group="production", instance="0", job="api-server"} => 0 @[%v]`,
`http_requests{group="production", instance="1", job="api-server"} => 0 @[%v]`,
},
fullRanges: 2,
intervalRanges: 0,
},
{
expr: `sum_over_time(http_requests{group="production",job="api-server"}[1h])`,
output: []string{
`http_requests{group="production", instance="0", job="api-server"} => 550 @[%v]`,
`http_requests{group="production", instance="1", job="api-server"} => 1100 @[%v]`,
},
fullRanges: 2,
intervalRanges: 0,
},
}
tieredStorage, closer := newTestStorage(t)