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9eafed0f79
This follow a simple function-based approach to access the count and
sum fields of a native Histogram. It might be more elegant to
implement “accessors” via the dot operator, as considered in the
brainstorming doc [1]. However, that would require the introduction of
a whole new concept in PromQL. For the PoC, we should be fine with the
function-based approch. Even the obvious inefficiencies (rate'ing a
whole histogram twice when we only want to rate each the count and the
sum once) could be optimized behind the scenes.
Note that the function-based approach elegantly solves the problem of
detecting counter resets in the sum of observations in the case of
negative observations. (Since the whole native Histogram is rate'd,
the counter reset is detected for the Histogram as a whole.)
We will decide later if an “accessor” approach is really needed. It
would change the example expression for average duration in
functions.md from
histogram_sum(rate(http_request_duration_seconds[10m]))
/
histogram_count(rate(http_request_duration_seconds[10m]))
to
rate(http_request_duration_seconds.sum[10m])
/
rate(http_request_duration_seconds.count[10m])
[1]: https://docs.google.com/document/d/1ch6ru8GKg03N02jRjYriurt-CZqUVY09evPg6yKTA1s/edit
Signed-off-by: beorn7 <beorn@grafana.com>
394 lines
9.7 KiB
Go
394 lines
9.7 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package parser
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// Function represents a function of the expression language and is
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// used by function nodes.
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type Function struct {
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Name string
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ArgTypes []ValueType
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Variadic int
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ReturnType ValueType
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}
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// Functions is a list of all functions supported by PromQL, including their types.
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var Functions = map[string]*Function{
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"abs": {
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Name: "abs",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"absent": {
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Name: "absent",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"absent_over_time": {
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Name: "absent_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"acos": {
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Name: "acos",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"acosh": {
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Name: "acosh",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"asin": {
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Name: "asin",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"asinh": {
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Name: "asinh",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"atan": {
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Name: "atan",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"atanh": {
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Name: "atanh",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"avg_over_time": {
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Name: "avg_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"ceil": {
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Name: "ceil",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"changes": {
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Name: "changes",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"clamp": {
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Name: "clamp",
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ArgTypes: []ValueType{ValueTypeVector, ValueTypeScalar, ValueTypeScalar},
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ReturnType: ValueTypeVector,
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},
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"clamp_max": {
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Name: "clamp_max",
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ArgTypes: []ValueType{ValueTypeVector, ValueTypeScalar},
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ReturnType: ValueTypeVector,
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},
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"clamp_min": {
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Name: "clamp_min",
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ArgTypes: []ValueType{ValueTypeVector, ValueTypeScalar},
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ReturnType: ValueTypeVector,
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},
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"cos": {
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Name: "cos",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"cosh": {
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Name: "cosh",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"count_over_time": {
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Name: "count_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"days_in_month": {
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Name: "days_in_month",
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ArgTypes: []ValueType{ValueTypeVector},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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"day_of_month": {
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Name: "day_of_month",
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ArgTypes: []ValueType{ValueTypeVector},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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"day_of_week": {
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Name: "day_of_week",
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ArgTypes: []ValueType{ValueTypeVector},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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"day_of_year": {
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Name: "day_of_year",
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ArgTypes: []ValueType{ValueTypeVector},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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"deg": {
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Name: "deg",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"delta": {
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Name: "delta",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"deriv": {
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Name: "deriv",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"exp": {
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Name: "exp",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"floor": {
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Name: "floor",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"histogram_count": {
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Name: "histogram_count",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"histogram_sum": {
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Name: "histogram_sum",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"histogram_fraction": {
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Name: "histogram_fraction",
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ArgTypes: []ValueType{ValueTypeScalar, ValueTypeScalar, ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"histogram_quantile": {
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Name: "histogram_quantile",
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ArgTypes: []ValueType{ValueTypeScalar, ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"holt_winters": {
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Name: "holt_winters",
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ArgTypes: []ValueType{ValueTypeMatrix, ValueTypeScalar, ValueTypeScalar},
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ReturnType: ValueTypeVector,
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},
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"hour": {
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Name: "hour",
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ArgTypes: []ValueType{ValueTypeVector},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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"idelta": {
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Name: "idelta",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"increase": {
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Name: "increase",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"irate": {
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Name: "irate",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"label_replace": {
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Name: "label_replace",
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ArgTypes: []ValueType{ValueTypeVector, ValueTypeString, ValueTypeString, ValueTypeString, ValueTypeString},
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ReturnType: ValueTypeVector,
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},
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"label_join": {
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Name: "label_join",
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ArgTypes: []ValueType{ValueTypeVector, ValueTypeString, ValueTypeString, ValueTypeString},
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Variadic: -1,
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ReturnType: ValueTypeVector,
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},
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"last_over_time": {
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Name: "last_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"ln": {
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Name: "ln",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"log10": {
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Name: "log10",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"log2": {
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Name: "log2",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"max_over_time": {
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Name: "max_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"min_over_time": {
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Name: "min_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"minute": {
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Name: "minute",
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ArgTypes: []ValueType{ValueTypeVector},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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"month": {
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Name: "month",
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ArgTypes: []ValueType{ValueTypeVector},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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"pi": {
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Name: "pi",
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ArgTypes: []ValueType{},
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ReturnType: ValueTypeScalar,
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},
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"predict_linear": {
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Name: "predict_linear",
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ArgTypes: []ValueType{ValueTypeMatrix, ValueTypeScalar},
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ReturnType: ValueTypeVector,
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},
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"present_over_time": {
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Name: "present_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"quantile_over_time": {
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Name: "quantile_over_time",
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ArgTypes: []ValueType{ValueTypeScalar, ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"rad": {
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Name: "rad",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"rate": {
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Name: "rate",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"resets": {
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Name: "resets",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"round": {
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Name: "round",
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ArgTypes: []ValueType{ValueTypeVector, ValueTypeScalar},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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"scalar": {
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Name: "scalar",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeScalar,
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},
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"sgn": {
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Name: "sgn",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"sin": {
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Name: "sin",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"sinh": {
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Name: "sinh",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"sort": {
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Name: "sort",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"sort_desc": {
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Name: "sort_desc",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"sqrt": {
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Name: "sqrt",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"stddev_over_time": {
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Name: "stddev_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"stdvar_over_time": {
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Name: "stdvar_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"sum_over_time": {
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Name: "sum_over_time",
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ArgTypes: []ValueType{ValueTypeMatrix},
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ReturnType: ValueTypeVector,
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},
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"tan": {
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Name: "tan",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"tanh": {
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Name: "tanh",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"time": {
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Name: "time",
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ArgTypes: []ValueType{},
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ReturnType: ValueTypeScalar,
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},
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"timestamp": {
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Name: "timestamp",
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ArgTypes: []ValueType{ValueTypeVector},
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ReturnType: ValueTypeVector,
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},
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"vector": {
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Name: "vector",
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ArgTypes: []ValueType{ValueTypeScalar},
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ReturnType: ValueTypeVector,
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},
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"year": {
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Name: "year",
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ArgTypes: []ValueType{ValueTypeVector},
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Variadic: 1,
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ReturnType: ValueTypeVector,
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},
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}
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// getFunction returns a predefined Function object for the given name.
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func getFunction(name string) (*Function, bool) {
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function, ok := Functions[name]
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return function, ok
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}
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