forked from prometheus/alertmanager
/
inhibit.go
144 lines (124 loc) · 4.07 KB
/
inhibit.go
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// Copyright 2015 Prometheus Team
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"sync"
"github.com/prometheus/common/log"
"github.com/prometheus/common/model"
"github.com/prometheus/alertmanager/config"
"github.com/prometheus/alertmanager/provider"
"github.com/prometheus/alertmanager/types"
)
// An Inhibitor determines whether a given label set is muted
// based on the currently active alerts and a set of inhibition rules.
type Inhibitor struct {
alerts provider.Alerts
rules []*InhibitRule
marker types.Marker
mtx sync.RWMutex
}
// NewInhibitor returns a new Inhibitor.
func NewInhibitor(ap provider.Alerts, rs []*config.InhibitRule, mk types.Marker) *Inhibitor {
ih := &Inhibitor{
alerts: ap,
marker: mk,
}
for _, cr := range rs {
ih.rules = append(ih.rules, NewInhibitRule(cr))
}
return ih
}
// Mutes returns true iff the given label set is muted.
func (ih *Inhibitor) Mutes(lset model.LabelSet) bool {
alerts := ih.alerts.GetPending()
defer alerts.Close()
// TODO(fabxc): improve erroring for iterators so it does not
// go silenced here.
for alert := range alerts.Next() {
if err := alerts.Err(); err != nil {
log.Errorf("Error iterating alerts: %s", err)
continue
}
if alert.Resolved() {
continue
}
for _, rule := range ih.rules {
if rule.Mutes(alert.Labels, lset) {
ih.marker.SetInhibited(lset.Fingerprint(), true)
return true
}
}
}
if err := alerts.Err(); err != nil {
log.Errorf("Error after iterating alerts: %s", err)
}
ih.marker.SetInhibited(lset.Fingerprint(), false)
return false
}
// An InhibitRule specifies that a class of (source) alerts should inhibit
// notifications for another class of (target) alerts if all specified matching
// labels are equal between the two alerts. This may be used to inhibit alerts
// from sending notifications if their meaning is logically a subset of a
// higher-level alert.
type InhibitRule struct {
// The set of Filters which define the group of source alerts (which inhibit
// the target alerts).
SourceMatchers types.Matchers
// The set of Filters which define the group of target alerts (which are
// inhibited by the source alerts).
TargetMatchers types.Matchers
// A set of label names whose label values need to be identical in source and
// target alerts in order for the inhibition to take effect.
Equal map[model.LabelName]struct{}
}
// NewInhibitRule returns a new InihibtRule based on a configuration definition.
func NewInhibitRule(cr *config.InhibitRule) *InhibitRule {
var (
sourcem types.Matchers
targetm types.Matchers
)
for ln, lv := range cr.SourceMatch {
sourcem = append(sourcem, types.NewMatcher(model.LabelName(ln), lv))
}
for ln, lv := range cr.SourceMatchRE {
sourcem = append(sourcem, types.NewRegexMatcher(model.LabelName(ln), lv.Regexp))
}
for ln, lv := range cr.TargetMatch {
targetm = append(targetm, types.NewMatcher(model.LabelName(ln), lv))
}
for ln, lv := range cr.TargetMatchRE {
targetm = append(targetm, types.NewRegexMatcher(model.LabelName(ln), lv.Regexp))
}
equal := map[model.LabelName]struct{}{}
for _, ln := range cr.Equal {
equal[ln] = struct{}{}
}
return &InhibitRule{
SourceMatchers: sourcem,
TargetMatchers: targetm,
Equal: equal,
}
}
// Mutes returns true iff the Inhibition rule applies for the given
// source and target label set.
func (r *InhibitRule) Mutes(source, target model.LabelSet) bool {
if !r.TargetMatchers.Match(target) || !r.SourceMatchers.Match(source) {
return false
}
for ln := range r.Equal {
if source[ln] != target[ln] {
return false
}
}
return true
}