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alert.go
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alert.go
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package notifier
import (
"bytes"
"fmt"
"io"
"strings"
textTpl "text/template"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/templates"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/utils"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
)
// Alert the triggered alert
// TODO: Looks like alert name isn't unique
type Alert struct {
// GroupID contains the ID of the parent rules group
GroupID uint64
// Name represents Alert name
Name string
// Labels is the list of label-value pairs attached to the Alert
Labels map[string]string
// Annotations is the list of annotations generated on Alert evaluation
Annotations map[string]string
// State represents the current state of the Alert
State AlertState
// Expr contains expression that was executed to generate the Alert
Expr string
// ActiveAt defines the moment of time when Alert has become active
ActiveAt time.Time
// Start defines the moment of time when Alert has become firing
Start time.Time
// End defines the moment of time when Alert supposed to expire
End time.Time
// ResolvedAt defines the moment when Alert was switched from Firing to Inactive
ResolvedAt time.Time
// LastSent defines the moment when Alert was sent last time
LastSent time.Time
// Value stores the value returned from evaluating expression from Expr field
Value float64
// ID is the unique identifer for the Alert
ID uint64
// Restored is true if Alert was restored after restart
Restored bool
}
// AlertState type indicates the Alert state
type AlertState int
const (
// StateInactive is the state of an alert that is neither firing nor pending.
StateInactive AlertState = iota
// StatePending is the state of an alert that has been active for less than
// the configured threshold duration.
StatePending
// StateFiring is the state of an alert that has been active for longer than
// the configured threshold duration.
StateFiring
)
// String stringer for AlertState
func (as AlertState) String() string {
switch as {
case StateFiring:
return "firing"
case StatePending:
return "pending"
}
return "inactive"
}
// AlertTplData is used to execute templating
type AlertTplData struct {
Labels map[string]string
Value float64
Expr string
}
var tplHeaders = []string{
"{{ $value := .Value }}",
"{{ $labels := .Labels }}",
"{{ $expr := .Expr }}",
"{{ $externalLabels := .ExternalLabels }}",
"{{ $externalURL := .ExternalURL }}",
}
// ExecTemplate executes the Alert template for given
// map of annotations.
// Every alert could have a different datasource, so function
// requires a queryFunction as an argument.
func (a *Alert) ExecTemplate(q templates.QueryFn, labels, annotations map[string]string) (map[string]string, error) {
tplData := AlertTplData{Value: a.Value, Labels: labels, Expr: a.Expr}
tmpl, err := templates.GetWithFuncs(templates.FuncsWithQuery(q))
if err != nil {
return nil, fmt.Errorf("error getting a template: %w", err)
}
return templateAnnotations(annotations, tplData, tmpl, true)
}
// ExecTemplate executes the given template for given annotations map.
func ExecTemplate(q templates.QueryFn, annotations map[string]string, tplData AlertTplData) (map[string]string, error) {
tmpl, err := templates.GetWithFuncs(templates.FuncsWithQuery(q))
if err != nil {
return nil, fmt.Errorf("error cloning template: %w", err)
}
return templateAnnotations(annotations, tplData, tmpl, true)
}
// ValidateTemplates validate annotations for possible template error, uses empty data for template population
func ValidateTemplates(annotations map[string]string) error {
tmpl, err := templates.Get()
if err != nil {
return err
}
_, err = templateAnnotations(annotations, AlertTplData{
Labels: map[string]string{},
Value: 0,
}, tmpl, false)
return err
}
func templateAnnotations(annotations map[string]string, data AlertTplData, tmpl *textTpl.Template, execute bool) (map[string]string, error) {
var builder strings.Builder
var buf bytes.Buffer
eg := new(utils.ErrGroup)
r := make(map[string]string, len(annotations))
tData := tplData{data, externalLabels, externalURL}
header := strings.Join(tplHeaders, "")
for key, text := range annotations {
buf.Reset()
builder.Reset()
builder.Grow(len(header) + len(text))
builder.WriteString(header)
builder.WriteString(text)
if err := templateAnnotation(&buf, builder.String(), tData, tmpl, execute); err != nil {
r[key] = text
eg.Add(fmt.Errorf("key %q, template %q: %w", key, text, err))
continue
}
r[key] = buf.String()
}
return r, eg.Err()
}
type tplData struct {
AlertTplData
ExternalLabels map[string]string
ExternalURL string
}
func templateAnnotation(dst io.Writer, text string, data tplData, tmpl *textTpl.Template, execute bool) error {
tpl, err := tmpl.Clone()
if err != nil {
return fmt.Errorf("error cloning template before parse annotation: %w", err)
}
tpl, err = tpl.Parse(text)
if err != nil {
return fmt.Errorf("error parsing annotation template: %w", err)
}
if !execute {
return nil
}
if err = tpl.Execute(dst, data); err != nil {
return fmt.Errorf("error evaluating annotation template: %w", err)
}
return nil
}
func (a Alert) toPromLabels(relabelCfg *promrelabel.ParsedConfigs) []prompbmarshal.Label {
var labels []prompbmarshal.Label
for k, v := range a.Labels {
labels = append(labels, prompbmarshal.Label{
Name: k,
Value: v,
})
}
promrelabel.SortLabels(labels)
if relabelCfg != nil {
return relabelCfg.Apply(labels, 0, false)
}
return labels
}