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// Copyright 2013 The Prometheus Authors
// 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 model
import (
"fmt"
"time"
)
type AlertStatus string
const (
AlertFiring AlertStatus = "firing"
AlertResolved AlertStatus = "resolved"
)
// Alert is a generic representation of an alert in the Prometheus eco-system.
type Alert struct {
// Label value pairs for purpose of aggregation, matching, and disposition
// dispatching. This must minimally include an "alertname" label.
Labels LabelSet `json:"labels"`
// Extra key/value information which does not define alert identity.
Annotations LabelSet `json:"annotations"`
// The known time range for this alert. Both ends are optional.
StartsAt time.Time `json:"startsAt,omitempty"`
EndsAt time.Time `json:"endsAt,omitempty"`
GeneratorURL string `json:"generatorURL"`
}
// Name returns the name of the alert. It is equivalent to the "alertname" label.
func (a *Alert) Name() string {
return string(a.Labels[AlertNameLabel])
}
// Fingerprint returns a unique hash for the alert. It is equivalent to
// the fingerprint of the alert's label set.
func (a *Alert) Fingerprint() Fingerprint {
return a.Labels.Fingerprint()
}
func (a *Alert) String() string {
s := fmt.Sprintf("%s[%s]", a.Name(), a.Fingerprint().String()[:7])
if a.Resolved() {
return s + "[resolved]"
}
return s + "[active]"
}
// Resolved returns true iff the activity interval ended in the past.
func (a *Alert) Resolved() bool {
return a.ResolvedAt(time.Now())
}
// ResolvedAt returns true off the activity interval ended before
// the given timestamp.
func (a *Alert) ResolvedAt(ts time.Time) bool {
if a.EndsAt.IsZero() {
return false
}
return !a.EndsAt.After(ts)
}
// Status returns the status of the alert.
func (a *Alert) Status() AlertStatus {
if a.Resolved() {
return AlertResolved
}
return AlertFiring
}
// Validate checks whether the alert data is inconsistent.
func (a *Alert) Validate() error {
if a.StartsAt.IsZero() {
return fmt.Errorf("start time missing")
}
if !a.EndsAt.IsZero() && a.EndsAt.Before(a.StartsAt) {
return fmt.Errorf("start time must be before end time")
}
if err := a.Labels.Validate(); err != nil {
return fmt.Errorf("invalid label set: %s", err)
}
if len(a.Labels) == 0 {
return fmt.Errorf("at least one label pair required")
}
if err := a.Annotations.Validate(); err != nil {
return fmt.Errorf("invalid annotations: %s", err)
}
return nil
}
// Alert is a list of alerts that can be sorted in chronological order.
type Alerts []*Alert
func (as Alerts) Len() int { return len(as) }
func (as Alerts) Swap(i, j int) { as[i], as[j] = as[j], as[i] }
func (as Alerts) Less(i, j int) bool {
if as[i].StartsAt.Before(as[j].StartsAt) {
return true
}
if as[i].EndsAt.Before(as[j].EndsAt) {
return true
}
return as[i].Fingerprint() < as[j].Fingerprint()
}
// HasFiring returns true iff one of the alerts is not resolved.
func (as Alerts) HasFiring() bool {
for _, a := range as {
if !a.Resolved() {
return true
}
}
return false
}
// Status returns StatusFiring iff at least one of the alerts is firing.
func (as Alerts) Status() AlertStatus {
if as.HasFiring() {
return AlertFiring
}
return AlertResolved
}
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