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monitoring.go
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monitoring.go
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// Copyright (c) 2020 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 clusterautoscaler
import (
"bytes"
"strings"
"text/template"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
)
const (
monitoringPrometheusJobName = "cluster-autoscaler"
monitoringMetricProcessMaxFds = "process_max_fds"
monitoringMetricProcessOpenFds = "process_open_fds"
monitoringAlertingRules = `groups:
- name: cluster-autoscaler.rules
rules:
- alert: ClusterAutoscalerDown
expr: absent(up{job="` + monitoringPrometheusJobName + `"} == 1)
for: 7m
labels:
service: ` + v1beta1constants.DeploymentNameClusterAutoscaler + `
severity: critical
type: seed
annotations:
description: There is no running cluster autoscaler. Shoot's Nodes wont be scaled dynamically, based on the load.
summary: Cluster autoscaler is down
`
)
var (
monitoringAllowedMetrics = []string{
monitoringMetricProcessMaxFds,
monitoringMetricProcessOpenFds,
}
monitoringScrapeConfigTmpl = `job_name: ` + monitoringPrometheusJobName + `
honor_labels: false
kubernetes_sd_configs:
- role: endpoints
namespaces:
names: [{{ .namespace }}]
relabel_configs:
- source_labels:
- __meta_kubernetes_service_name
- __meta_kubernetes_endpoint_port_name
action: keep
regex: ` + ServiceName + `;` + portNameMetrics + `
- action: labelmap
regex: __meta_kubernetes_service_label_(.+)
- source_labels: [ __meta_kubernetes_pod_name ]
target_label: pod
metric_relabel_configs:
- source_labels: [ __name__ ]
action: keep
regex: ^(` + strings.Join(monitoringAllowedMetrics, "|") + `)$
`
monitoringScrapeConfigTemplate *template.Template
)
func init() {
var err error
monitoringScrapeConfigTemplate, err = template.New("monitoring-scrape-config").Parse(monitoringScrapeConfigTmpl)
utilruntime.Must(err)
}
// ScrapeConfigs returns the scrape configurations for Prometheus.
func (c *clusterAutoscaler) ScrapeConfigs() ([]string, error) {
var scrapeConfig bytes.Buffer
if err := monitoringScrapeConfigTemplate.Execute(&scrapeConfig, map[string]interface{}{"namespace": c.namespace}); err != nil {
return nil, err
}
return []string{scrapeConfig.String()}, nil
}
// AlertingRules returns the alerting rules for AlertManager.
func (c *clusterAutoscaler) AlertingRules() (map[string]string, error) {
return map[string]string{"cluster-autoscaler.rules.yaml": monitoringAlertingRules}, nil
}