apiVersion: v1
kind: ConfigMap
metadata:
  name: prom-config
data:
  prom-config: |-
    global:
      scrape_interval: 15s

    scrape_configs:
      - job_name: mysql # To get metrics about the mysql exporter’s targets
        params:
          auth_module: [client]
        static_configs:
          - targets:
            # All mysql hostnames or unix sockets to monitor.
              - mysql-0.base.svc:3306
              - mysql-1.base.svc:3306
              - mysql-2.base.svc:3306
              - mysql-3.base.svc:3306
        relabel_configs:
          - source_labels: [__address__]
            target_label: __param_target
          - source_labels: [__param_target]
            target_label: instance
          - target_label: __address__
            replacement: mysqld-exporter.base.svc:9104
    rule_files:
      - /etc/prometheus/rules/rule-0.yaml
    alerting:
      alert_relabel_configs:
      alertmanagers:
  prom-rule-0: |-
    groups:
    - name: mysqld_rules
      rules:
    
      # Record slave lag seconds for pre-computed timeseries that takes
      # `mysql_slave_status_sql_delay` into account
      - record: instance:mysql_slave_lag_seconds
        expr: mysql_slave_status_seconds_behind_master - mysql_slave_status_sql_delay
    
      # Record slave lag via heartbeat method
      - record: instance:mysql_heartbeat_lag_seconds
        expr: mysql_heartbeat_now_timestamp_seconds - mysql_heartbeat_stored_timestamp_seconds
    
      - record: job:mysql_transactions:rate5m
        expr: sum without (command) (rate(mysql_global_status_commands_total{command=~"(commit|rollback)"}[5m]))
    
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: prometheus
spec:
  replicas: 1
  serviceName: prometheus
  selector:
    matchLabels:
      app: prometheus
  template:
    metadata:
      labels:
        app: prometheus
    spec:
      containers:
      - name: prometheus
        image: prom/prometheus:v2.51.2
        securityContext:
          runAsUser: 0
          allowPrivilegeEscalation: false
        args:
          - --config.file=/etc/prometheus/prometheus.yaml
          - --storage.tsdb.path=/etc/prometheus/data
          - --storage.tsdb.retention.time=15d
        volumeMounts:
        - name: prometheus
          mountPath: /prometheus/
        - name: prom-config
          mountPath: /etc/prometheus/prometheus.yaml
          subPath: prometheus.yaml
          readOnly: true
        - name: prom-config
          mountPath: /etc/prometheus/rules/rule-0.yaml
          subPath: rule-0.yaml
          readOnly: true
      volumes:
      - name: prometheus
        hostPath:
          path: /data/prometheus/data/
      - name: prom-config
        configMap:
          name: prom-config
          items:
          - key: prom-config
            path: prometheus.yaml
          - key: prom-rule-0
            path: rule-0.yaml
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: "kubernetes.io/hostname"
                operator: In
                values:
                - bfs-k8snode-10-2-2-7.hetzner.base.beaconfireinc.com

---
apiVersion: v1
kind: Service
metadata:
  name: prometheus
  labels:
    app: prometheus
spec:
  ports:
  - protocol: TCP
    port: 9090
    targetPort: 9090
  selector:
    app: prometheus
  type: ClusterIP