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Alerting: add template funcs (#38404)

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* Alerting: (wip) add template funcs

* Alerting: (wip) numeric template functions

* Alerting: (wip) template functions

* Test for the "args" function

* Alerting: (wip) Documentation for template functions

* Alerting: template functions - refactor

* code review changes

* disable linter error

* Use Prometheus implementation of TemplateExpander

* Update docs/sources/alerting/unified-alerting/alerting-rules/create-grafana-managed-rule.md

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
This commit is contained in:
Santiago
2021-09-15 18:48:29 -03:00
committed by GitHub
parent cde133fe05
commit d6fb0181fb
9 changed files with 685 additions and 257 deletions
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68
pkg/services/ngalert/state/cache.go
View File

@@ -1,13 +1,9 @@
package state
import (
"bytes"
"fmt"
"math"
"strconv"
"strings"
"sync"
text_template "text/template"
"github.com/grafana/grafana-plugin-sdk-go/data"
@@ -107,70 +103,6 @@ func (c *cache) expandRuleLabelsAndAnnotations(alertRule *ngModels.AlertRule, la
return expand(alertRule.Labels), expand(alertRule.Annotations)
}
// templateCaptureValue represents each value in .Values in the annotations
// and labels template.
type templateCaptureValue struct {
Labels map[string]string
Value float64
}
// String implements the Stringer interface to print the value of each RefID
// in the template via {{ $values.A }} rather than {{ $values.A.Value }}.
func (v templateCaptureValue) String() string {
return strconv.FormatFloat(v.Value, 'f', -1, 64)
}
func expandTemplate(name, text string, labels map[string]string, alertInstance eval.Result) (result string, resultErr error) {
name = "__alert_" + name
text = "{{- $labels := .Labels -}}{{- $values := .Values -}}{{- $value := .Value -}}" + text
// It'd better to have no alert description than to kill the whole process
// if there's a bug in the template.
defer func() {
if r := recover(); r != nil {
var ok bool
resultErr, ok = r.(error)
if !ok {
resultErr = fmt.Errorf("panic expanding template %v: %v", name, r)
}
}
}()
tmpl, err := text_template.New(name).Option("missingkey=error").Parse(text)
if err != nil {
return "", fmt.Errorf("error parsing template %v: %s", name, err.Error())
}
var buffer bytes.Buffer
if err := tmpl.Execute(&buffer, struct {
Labels map[string]string
Values map[string]templateCaptureValue
Value string
}{
Labels: labels,
Values: newTemplateCaptureValues(alertInstance.Values),
Value: alertInstance.EvaluationString,
}); err != nil {
return "", fmt.Errorf("error executing template %v: %s", name, err.Error())
}
return buffer.String(), nil
}
func newTemplateCaptureValues(values map[string]eval.NumberValueCapture) map[string]templateCaptureValue {
m := make(map[string]templateCaptureValue)
for k, v := range values {
var f float64
if v.Value != nil {
f = *v.Value
} else {
f = math.NaN()
}
m[k] = templateCaptureValue{
Labels: v.Labels,
Value: f,
}
}
return m
}
func (c *cache) set(entry *State) {
c.mtxStates.Lock()
defer c.mtxStates.Unlock()