nixos-servers/services/monitoring/prometheus.nix

{ ... }:
{
  services.prometheus = {
    enable = true;
    alertmanager = {
      enable = true;
      configuration = {
        global =
          {
          };
        route = {
          receiver = "webhook_gunter";
          group_wait = "30s";
          group_interval = "5m";
          repeat_interval = "12h";
          group_by = [ "alertname" ];
        };
        receivers = [
          {
            name = "webhook_gunter";
            webhook_configs = [
              {
                url = "http://gunter.home.2rjus.net:5001/alert";
              }
            ];
          }
        ];
      };
    };
    rules = [
      ''
        groups:
          - name: common_rules
            rules:
              - alert: node_down
                expr: up == 0
                for: 5m
                labels:
                  severity: critical
                annotations: 
                  summary: "Instance {{ $labels.instance }} down"
                  description: "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 5 minutes."
          - name: nameserver_rules 
            rules:
              - alert: unbound_down
                expr: node_systemd_unit_state {instance =~ "ns.+", name = "unbound.service", state = "active"} == 0
                for: 5m
                labels:
                  severity: critical
                annotations: 
                  summary: "Unbound not running on {{ $labels.instance }}"
                  description: "Unbound has been down on {{ $labels.instance }} more than 5 minutes."
              - alert: nsd_down
                expr: node_systemd_unit_state {instance =~ "ns.+", name = "nsd.service", state = "active"} == 0
                for: 5m
                labels:
                  severity: critical
                annotations: 
                  summary: "NSD not running on {{ $labels.instance }}"
                  description: "NSD has been down on {{ $labels.instance }} more than 5 minutes."
          - name: http-proxy_rules 
            rules:
              - alert: caddy_down
                expr: node_systemd_unit_state {instance="http-proxy.home.2rjus.net:9100", name = "caddy.service", state = "active"} == 0
                for: 5m
                labels:
                  severity: critical
                annotations: 
                  summary: "Caddy not running on {{ $labels.instance }}"
                  description: "Caddy has been down on {{ $labels.instance }} more than 5 minutes."
          - name: home_assistant_rules 
            rules:
              - alert: home_assistant_down 
                expr: node_systemd_unit_state {instance="ha1.home.2rjus.net:9100", name="home-assistant.service", state="active"}  == 0
                for: 5m
                labels:
                  severity: critical
                annotations: 
                  summary: "Home assistant not running on {{ $labels.instance }}"
                  description: "Home assistant has been down on {{ $labels.instance }} more than 5 minutes."
              - alert: zigbee2qmtt_down 
                expr: node_systemd_unit_state {instance = "ha1.home.2rjus.net:9100", name = "zigbee2mqtt.service", state = "active"} == 0
                for: 5m
                labels:
                  severity: critical
                annotations: 
                  summary: "Zigbee2mqtt not running on {{ $labels.instance }}"
                  description: "Zigbee2mqtt has been down on {{ $labels.instance }} more than 5 minutes."
              - alert: mosquitto_down
                expr: node_systemd_unit_state {instance = "ha1.home.2rjus.net:9100", name = "mosquitto.service", state = "active"} == 0
                for: 5m
                labels:
                  severity: critical
                annotations: 
                  summary: "Mosquitto not running on {{ $labels.instance }}"
                  description: "Mosquitto has been down on {{ $labels.instance }} more than 5 minutes."
      ''
    ];

    scrapeConfigs = [
      {
        job_name = "node-exporter";
        static_configs = [
          {
            targets = [
              # Node exporter
              "gunter.home.2rjus.net:9100"
              "ca.home.2rjus.net:9100"
              "monitoring01.home.2rjus.net:9100"
              "ns1.home.2rjus.net:9100"
              "ns2.home.2rjus.net:9100"
              "http-proxy.home.2rjus.net:9100"
              "ha1.home.2rjus.net:9100"
            ];
          }
        ];
      }
    ];
  };
}