Cert Manager Exporter - GKE

cert-manager-exporter.yaml

apiVersion: v1
data:
  prometheus.yaml: |
    global:
      scrape_interval:     300s
      evaluation_interval: 300s
    rule_files:
      - "cert_rules.yaml"
    scrape_configs:
      - job_name: certmanager
        static_configs:
        - targets: ['cert-manager.cert-manager:9402']
        metric_relabel_configs:
        - source_labels: ['namespace']
          target_label: 'k8s_ns'
  cert_rules.yaml: |
    groups:
    - name: certificate_rules
      rules:
      - record: certificate_expire_remaining_days 
        expr: (certmanager_certificate_expiration_timestamp_seconds - time())/86400
  sdexporter.yaml: |
    static_metadata:
    - metric: certificate_expire_remaining_days
      type: gauge 
      value_type: double 
      help: Seconds until a certificate days
kind: ConfigMap
metadata:
  name: exporterconfig
  namespace: kube-system
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: prom-certmanager
  name: prom-certmanager
  namespace: kube-system
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prom-certmanager
  template:
    metadata:
      labels:
        app: prom-certmanager
    spec:
      containers:
      - image: prom/prometheus:v2.24.1
        name: prometheus
        args:
        - --storage.tsdb.path=/data
        - --config.file=/etc/prometheus/prometheus.yaml
        volumeMounts:
        - mountPath: /etc/prometheus
          name: exporterconfig
        - mountPath: /data
          name: promdata
      - name: sidecar
        image: gcr.io/stackdriver-prometheus/stackdriver-prometheus-sidecar:0.8.2
        imagePullPolicy: Always
        args:
        - --stackdriver.project-id=fluent-plate-304118
        - --stackdriver.generic.location=us-central1-c
        - --stackdriver.generic.namespace=cert-manager
        - --prometheus.api-address=http://127.0.0.1:9090
        - --prometheus.wal-directory=/data/wal
        - --include=certificate_expire_remaining_days
        - --config-file=/etc/stackdriver/sdexporter.yaml
        ports:
        - name: sidecar
          containerPort: 9091
        volumeMounts:
        - mountPath: /etc/stackdriver
          name: exporterconfig
        - name: promdata
          mountPath: /data
      volumes:
      - configMap:
          defaultMode: 420
          items:
          - key: prometheus.yaml
            path: prometheus.yaml
          - key: cert_rules.yaml
            path: cert_rules.yaml
          - key: sdexporter.yaml
            path: sdexporter.yaml
          name: exporterconfig
        name: exporterconfig
      - name: promdata
        emptyDir: {}