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monitoring.go
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monitoring.go
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// Copyright (c) 2021 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 coredns
import (
"strconv"
"strings"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/operation/botanist/component/kubeapiserver"
)
const (
monitoringPrometheusJobName = "coredns"
monitoringMetricBuildInfo = "coredns_build_info"
monitoringMetricCacheEntries = "coredns_cache_entries"
monitoringMetricCacheHitsTotal = "coredns_cache_hits_total"
monitoringMetricCacheMissesTotal = "coredns_cache_misses_total"
monitoringMetricDnsRequestDurationSecondsCount = "coredns_dns_request_duration_seconds_count"
monitoringMetricDnsRequestDurationSecondsBucket = "coredns_dns_request_duration_seconds_bucket"
monitoringMetricDnsResponsesTotal = "coredns_dns_responses_total"
monitoringMetricForwardRequestsTotal = "coredns_forward_requests_total"
monitoringMetricForwardResponsesTotal = "coredns_forward_responses_total"
monitoringMetricKubernetesDnsProgrammingDurationSecondsBucket = "coredns_kubernetes_dns_programming_duration_seconds_bucket"
monitoringMetricKubernetesDnsProgrammingDurationSecondsCount = "coredns_kubernetes_dns_programming_duration_seconds_count"
monitoringMetricKubernetesDnsProgrammingDurationSecondsSum = "coredns_kubernetes_dns_programming_duration_seconds_sum"
monitoringMetricProcessMaxFds = "process_max_fds"
monitoringMetricProcessOpenFds = "process_open_fds"
monitoringAlertingRules = `groups:
- name: coredns.rules
rules:
- alert: CoreDNSDown
expr: absent(up{job="` + monitoringPrometheusJobName + `"} == 1)
for: 20m
labels:
service: ` + serviceName + `
severity: critical
type: shoot
visibility: all
annotations:
description: CoreDNS could not be found. Cluster DNS resolution will not work.
summary: CoreDNS is down
`
)
var (
monitoringAllowedMetrics = []string{
monitoringMetricBuildInfo,
monitoringMetricCacheEntries,
monitoringMetricCacheHitsTotal,
monitoringMetricCacheMissesTotal,
monitoringMetricDnsRequestDurationSecondsCount,
monitoringMetricDnsRequestDurationSecondsBucket,
monitoringMetricDnsResponsesTotal,
monitoringMetricForwardRequestsTotal,
monitoringMetricForwardResponsesTotal,
monitoringMetricKubernetesDnsProgrammingDurationSecondsBucket,
monitoringMetricKubernetesDnsProgrammingDurationSecondsCount,
monitoringMetricKubernetesDnsProgrammingDurationSecondsSum,
monitoringMetricProcessMaxFds,
monitoringMetricProcessOpenFds,
}
// TODO: Replace below hard-coded paths to Prometheus certificates once its deployment has been refactored.
monitoringScrapeConfig = `job_name: ` + monitoringPrometheusJobName + `
scheme: https
tls_config:
ca_file: /etc/prometheus/seed/ca.crt
authorization:
type: Bearer
credentials_file: /var/run/secrets/gardener.cloud/shoot/token/token
honor_labels: false
kubernetes_sd_configs:
- role: endpoints
api_server: https://` + v1beta1constants.DeploymentNameKubeAPIServer + `:` + strconv.Itoa(kubeapiserver.Port) + `
tls_config:
ca_file: /etc/prometheus/seed/ca.crt
authorization:
type: Bearer
credentials_file: /var/run/secrets/gardener.cloud/shoot/token/token
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
- target_label: __address__
replacement: ` + v1beta1constants.DeploymentNameKubeAPIServer + `:` + strconv.Itoa(kubeapiserver.Port) + `
- source_labels: [__meta_kubernetes_pod_name,__meta_kubernetes_pod_container_port_number]
regex: (.+);(.+)
target_label: __metrics_path__
replacement: /api/v1/namespaces/kube-system/pods/${1}:${2}/proxy/metrics
metric_relabel_configs:
- source_labels: [ __name__ ]
action: keep
regex: ^(` + strings.Join(monitoringAllowedMetrics, "|") + `)$
`
)
// ScrapeConfigs returns the scrape configurations for Prometheus.
func (c *coreDNS) ScrapeConfigs() ([]string, error) {
return []string{monitoringScrapeConfig}, nil
}
// AlertingRules returns the alerting rules for AlertManager.
func (c *coreDNS) AlertingRules() (map[string]string, error) {
return map[string]string{"coredns.rules.yaml": monitoringAlertingRules}, nil
}