131 lines
3.1 KiB
Go
131 lines
3.1 KiB
Go
package main
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import (
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"sync"
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"github.com/prometheus/common/log"
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"github.com/prometheus/common/model"
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"github.com/prometheus/alertmanager/config"
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"github.com/prometheus/alertmanager/provider"
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"github.com/prometheus/alertmanager/types"
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)
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type Inhibitor struct {
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alerts provider.Alerts
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rules []*InhibitRule
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mtx sync.RWMutex
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}
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func (ih *Inhibitor) Mutes(lset model.LabelSet) bool {
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ih.mtx.RLock()
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defer ih.mtx.RUnlock()
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alerts := ih.alerts.GetPending()
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defer alerts.Close()
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// TODO(fabxc): improve erroring for iterators so it does not
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// go silenced here.
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for alert := range alerts.Next() {
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if err := alerts.Err(); err != nil {
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log.Errorf("Error iterating alerts: %s", err)
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continue
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}
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if alert.Resolved() {
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continue
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}
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for _, rule := range ih.rules {
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if rule.Mutes(alert.Labels, lset) {
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return true
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}
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}
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}
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return false
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}
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func (ih *Inhibitor) ApplyConfig(conf *config.Config) bool {
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ih.mtx.Lock()
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defer ih.mtx.Unlock()
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ih.rules = []*InhibitRule{}
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for _, cr := range conf.InhibitRules {
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ih.rules = append(ih.rules, NewInhibitRule(cr))
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}
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return true
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}
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// An InhibitRule specifies that a class of (source) alerts should inhibit
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// notifications for another class of (target) alerts if all specified matching
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// labels are equal between the two alerts. This may be used to inhibit alerts
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// from sending notifications if their meaning is logically a subset of a
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// higher-level alert.
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type InhibitRule struct {
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// The set of Filters which define the group of source alerts (which inhibit
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// the target alerts).
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SourceMatchers types.Matchers
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// The set of Filters which define the group of target alerts (which are
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// inhibited by the source alerts).
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TargetMatchers types.Matchers
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// A set of label names whose label values need to be identical in source and
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// target alerts in order for the inhibition to take effect.
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Equal map[model.LabelName]struct{}
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}
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func NewInhibitRule(cr *config.InhibitRule) *InhibitRule {
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var (
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sourcem types.Matchers
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targetm types.Matchers
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)
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for ln, lv := range cr.SourceMatch {
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sourcem = append(sourcem, types.NewMatcher(model.LabelName(ln), lv))
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}
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for ln, lv := range cr.SourceMatchRE {
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m, err := types.NewRegexMatcher(model.LabelName(ln), lv.String())
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if err != nil {
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// Must have been sanitized during config validation.
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panic(err)
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}
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sourcem = append(sourcem, m)
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}
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for ln, lv := range cr.TargetMatch {
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targetm = append(targetm, types.NewMatcher(model.LabelName(ln), lv))
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}
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for ln, lv := range cr.TargetMatchRE {
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m, err := types.NewRegexMatcher(model.LabelName(ln), lv.String())
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if err != nil {
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// Must have been sanitized during config validation.
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panic(err)
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}
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targetm = append(targetm, m)
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}
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equal := map[model.LabelName]struct{}{}
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for _, ln := range cr.Equal {
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equal[ln] = struct{}{}
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}
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return &InhibitRule{
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SourceMatchers: sourcem,
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TargetMatchers: targetm,
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Equal: equal,
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}
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}
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func (r *InhibitRule) Mutes(source, target model.LabelSet) bool {
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if !r.TargetMatchers.Match(target) || !r.SourceMatchers.Match(source) {
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return false
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}
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for ln := range r.Equal {
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if source[ln] != target[ln] {
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return false
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}
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}
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return true
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}
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