/
config.go
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/
config.go
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// Copyright 2024 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 alertmanager
import (
monitoringv1alpha1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1alpha1"
corev1 "k8s.io/api/core/v1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/gardener/gardener/pkg/component"
)
const dataKeyAuthPassword = "auth_password"
func (a *alertManager) config() *monitoringv1alpha1.AlertmanagerConfig {
if !a.hasSMTPSecret() {
return nil
}
var (
emailReceiverName = "email-kubernetes-ops"
visibility = "operator"
)
if a.values.ClusterType == component.ClusterTypeShoot {
visibility = "owner"
}
return &monitoringv1alpha1.AlertmanagerConfig{
ObjectMeta: metav1.ObjectMeta{
Name: a.name(),
Namespace: a.namespace,
},
Spec: monitoringv1alpha1.AlertmanagerConfigSpec{
// The root route on which each incoming alert enters.
Route: &monitoringv1alpha1.Route{
// The labels by which incoming alerts are grouped together.
GroupBy: []string{"service"},
// When a new group of alerts is created by an incoming alert, wait at least 'group_wait' to send the
// initial notification.
// This way ensures that you get multiple alerts for the same group that start firing shortly after
// another are batched together on the first notification.
GroupWait: "5m",
// When the first notification was sent, wait 'group_interval' to send a batch of new alerts that
// started firing for that group.
GroupInterval: "5m",
// If an alert has successfully been sent, wait 'repeat_interval' to resend them.
RepeatInterval: "72h",
// Send alerts by default to nowhere
Receiver: "dev-null",
// email only for critical and blocker
Routes: []apiextensionsv1.JSON{{Raw: []byte(`
{"matchers": [{"name": "visibility",
"matchType": "=~",
"value": "all|` + visibility + `"}],
"receiver": "` + emailReceiverName + `"}`)}},
},
InhibitRules: []monitoringv1alpha1.InhibitRule{
// Apply inhibition if the alert name is the same.
{
SourceMatch: []monitoringv1alpha1.Matcher{{Name: "severity", Value: "critical", MatchType: monitoringv1alpha1.MatchEqual}},
TargetMatch: []monitoringv1alpha1.Matcher{{Name: "severity", Value: "warning", MatchType: monitoringv1alpha1.MatchEqual}},
Equal: []string{"alertname", "service", "cluster"},
},
// Stop all alerts for type=shoot if there are VPN problems.
{
SourceMatch: []monitoringv1alpha1.Matcher{{Name: "service", Value: "vpn", MatchType: monitoringv1alpha1.MatchEqual}},
TargetMatch: []monitoringv1alpha1.Matcher{{Name: "type", Value: "shoot", MatchType: monitoringv1alpha1.MatchRegexp}},
Equal: []string{"type", "cluster"},
},
// Stop warning and critical alerts if there is a blocker
{
SourceMatch: []monitoringv1alpha1.Matcher{{Name: "severity", Value: "blocker", MatchType: monitoringv1alpha1.MatchEqual}},
TargetMatch: []monitoringv1alpha1.Matcher{{Name: "severity", Value: "^(critical|warning)$", MatchType: monitoringv1alpha1.MatchRegexp}},
Equal: []string{"cluster"},
},
// If the API server is down inhibit no worker nodes alert. No worker nodes depends on
// kube-state-metrics which depends on the API server.
{
SourceMatch: []monitoringv1alpha1.Matcher{{Name: "service", Value: "kube-apiserver", MatchType: monitoringv1alpha1.MatchEqual}},
TargetMatch: []monitoringv1alpha1.Matcher{{Name: "service", Value: "nodes", MatchType: monitoringv1alpha1.MatchRegexp}},
Equal: []string{"cluster"},
},
// If API server is down inhibit kube-state-metrics alerts.
{
SourceMatch: []monitoringv1alpha1.Matcher{{Name: "service", Value: "kube-apiserver", MatchType: monitoringv1alpha1.MatchEqual}},
TargetMatch: []monitoringv1alpha1.Matcher{{Name: "severity", Value: "info", MatchType: monitoringv1alpha1.MatchRegexp}},
Equal: []string{"cluster"},
},
// No Worker nodes depends on kube-state-metrics. Inhibit no worker nodes if kube-state-metrics is down.
{
SourceMatch: []monitoringv1alpha1.Matcher{{Name: "service", Value: "kube-state-metrics-shoot", MatchType: monitoringv1alpha1.MatchEqual}},
TargetMatch: []monitoringv1alpha1.Matcher{{Name: "service", Value: "nodes", MatchType: monitoringv1alpha1.MatchRegexp}},
Equal: []string{"cluster"},
},
},
Receivers: []monitoringv1alpha1.Receiver{
{Name: "dev-null"},
{
Name: emailReceiverName,
EmailConfigs: a.emailConfigs(),
},
},
},
}
}
func (a *alertManager) smtpSecret() *corev1.Secret {
if !a.hasSMTPSecret() {
return nil
}
return &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: a.name() + "-smtp",
Namespace: a.namespace,
},
Type: a.values.AlertingSMTPSecret.Type,
Data: map[string][]byte{dataKeyAuthPassword: a.values.AlertingSMTPSecret.Data[dataKeyAuthPassword]},
}
}
func (a *alertManager) hasSMTPSecret() bool {
return a.values.AlertingSMTPSecret != nil && string(a.values.AlertingSMTPSecret.Data["auth_type"]) == "smtp"
}
func (a *alertManager) emailConfigs() []monitoringv1alpha1.EmailConfig {
emailReceivers := []string{string(a.values.AlertingSMTPSecret.Data["to"])}
if len(a.values.EmailReceivers) > 0 {
emailReceivers = a.values.EmailReceivers
}
var configs []monitoringv1alpha1.EmailConfig
for _, email := range emailReceivers {
configs = append(configs, monitoringv1alpha1.EmailConfig{
To: email,
From: string(a.values.AlertingSMTPSecret.Data["from"]),
Smarthost: string(a.values.AlertingSMTPSecret.Data["smarthost"]),
AuthUsername: string(a.values.AlertingSMTPSecret.Data["auth_username"]),
AuthIdentity: string(a.values.AlertingSMTPSecret.Data["auth_identity"]),
AuthPassword: &corev1.SecretKeySelector{
LocalObjectReference: corev1.LocalObjectReference{Name: a.smtpSecret().Name},
Key: dataKeyAuthPassword,
},
})
}
return configs
}