homelab/nomad-job/prometheus.nomad

job "prometheus" {
  datacenters = ["homelab"]
  priority    = 50
  type        = "service"
  constraint {
    attribute = "${attr.cpu.arch}"
    value     = "amd64"
  }
  meta{
    force_deploy= 1
  }

  group "prometheus" {
    count = 1

    network {
      port "prometheus_ui" {
        static = 9090
      }
    }

    restart {
      attempts = 2
      interval = "30m"
      delay    = "15s"
      mode     = "fail"
    }
    vault {
      policies = ["prometheus"]
    }

    ephemeral_disk {
      size = 300
    }

    task "prometheus" {
      template {
        change_mode = "noop"
        destination = "local/prometheus.yml"

        data = <<EOH
---
global:
  scrape_interval:     10s
  evaluation_interval: 10s
alerting:
  alertmanagers:
  - consul_sd_configs:
    - server: 'consul.service.consul:8500'
      services: ['alertmanager']
rule_files:
  - "nomad-alert-rules.yml"

scrape_configs:

  - job_name: 'nomad_metrics'

    consul_sd_configs:
    - server: 'consul.service.consul:8500'
      services: ['nomad-client', 'nomad']

    relabel_configs:
    - source_labels: ['__meta_consul_tags']
      regex: '(.*)http(.*)'
      action: keep
    - source_labels: ['__meta_consul_dc']
      target_label:  'dc'

    scrape_interval: 5s
    metrics_path: /v1/metrics
    params:
      format: ['prometheus']
  - job_name: 'traefik'
    consul_sd_configs:
    - server: 'consul.service.consul:8500'
      services: ['traefik-local-admin','traefik-admin']
    relabel_configs:
    - source_labels: ['__meta_consul_service']
      target_label: instance

  - job_name: 'alertmanager'
    consul_sd_configs:
    - server: 'consul.service.consul:8500'
      services: ['alertmanager']
    relabel_configs:
    - source_labels: ['__meta_consul_dc']
      target_label: instance

  - job_name: 'crowdsec'
    consul_sd_configs:
    - server: 'consul.service.consul:8500'
      services: ['crowdsec-metrics']
    relabel_configs:
    - source_labels: [__meta_consul_node]
      target_label: machine
  - job_name: 'nodeexp'
    static_configs:
    consul_sd_configs:
    - server: 'consul.service.consul:8500'
      services: ['node-exporter']
    relabel_configs:
      - source_labels: [__meta_consul_node]
        target_label: instance
  - job_name: 'loki'
    consul_sd_configs:
    - server: consul.service.consul:8500
      services: ['loki']
    relabel_configs:
      - source_labels: ['__meta_consul_dc']
        target_label: instance
  - job_name: 'HASS'
    consul_sd_configs:
    - server: 'consul.service.consul:8500'
      services: ['hass']
    relabel_configs:
      - source_labels: ['__meta_consul_dc']
        target_label: instance
    scrape_interval: 60s
    metrics_path: /api/prometheus
    authorization:
      credentials: {{ with secret "secrets/data/nomad/prometheus"}}'{{ .Data.data.hass_token }}'{{end}}
  - job_name: 'nut'
    consul_sd_configs:
    - server: 'consul.service.consul:8500'
      services: ['nutexporter']
    metrics_path: /ups_metrics
    relabel_configs:
      - source_labels: ['__meta_consul_dc']
        target_label: instance






EOH
      }
      template {
        destination     = "local/nomad-alert-rules.yml"
        right_delimiter = "]]"
        left_delimiter  = "[["
        data            = <<EOH
---
groups:
- name: nomad_alerts
  rules:
  - alert: NomadBlockedEvaluation
    expr: nomad_nomad_blocked_evals_total_blocked > 0
    for: 0m
    labels:
      severity: warning
    annotations:
      summary: Nomad blocked evaluation (instance {{ $labels.instance }})
      description: "Nomad blocked evaluation\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
  - alert: NomadJobQueued
    expr: nomad_nomad_job_summary_queued > 0
    for: 2m
    labels:
      severity: warning
    annotations:
      summary: Nomad job queued (instance {{ $labels.instance }})
      description: "Nomad job queued\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
  - alert: NomadBatchError
    expr: nomad_nomad_job_summary_failed{parent_id=~".+"}>0
    labels:
        severity: warning
    annotations:
        summary: Nomad batch {{ $labels.parent_id}} error
  - alert: test gitea
    expr: nomad_nomad_job_summary_running{exported_job="git"}==0
    labels:
            severity: warning
- name: nut_alerts
  rules:
  - alert: UPSonBattery
    expr: network_ups_tools_ups_status{flag="OB"}==1
    labels:
        severity: warning
    annotations: 
      summary: UPS switched on battery
  - alert: UPSLowBattery
    expr: network_ups_tools_ups_status{flag="LB"}==1
    labels:
        severity: critical
    annotations: 
      summary: UPS is now on low battery please shutdown all device
  - alert: "UPS Battery needed to be replaced"
    expr: network_ups_tools_ups_status{flag="RB"}==1
    labels:
      severity: warning
    annotations:
      summary: UPS battery is detected to replace
- name: Node_alerts
  rules:
  - alert: HostOutOfMemory
    expr: (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes * 100 < 10) 
    for: 2m
    labels:
      severity: warning
    annotations:
      summary: Host out of memory (instance {{ $labels.instance }})
      description: "Node memory is filling up (< 10% left)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
  - alert: HostMemoryUnderMemoryPressure
    expr: (rate(node_vmstat_pgmajfault[1m]) > 600) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
    for: 2m
    labels:
      severity: critical
    annotations:
      summary: Host memory under memory pressure (instance {{ $labels.instance }})
      description: "The node is under heavy memory pressure. High rate of major page faults\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
  - alert: HostOutOfDiskSpace
    expr: ((node_filesystem_avail_bytes * 100) / node_filesystem_size_bytes < 10 and ON (instance, device, mountpoint) node_filesystem_readonly == 0) 
    for: 2m
    labels:
      severity: warning
    annotations:
      summary: Host out of disk space (instance {{ $labels.instance }})
      description: "Disk is almost full (< 10% left)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
  - alert: HostHighCpuLoad
    expr: (sum by (instance) (avg by (mode, instance) (rate(node_cpu_seconds_total{mode!="idle"}[2m]))) > 0.8)
    for: 10m
    labels:
      severity: warning
    annotations:
      summary: Host high CPU load (instance {{ $labels.instance }})
      description: "CPU load is > 80%\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
  - alert: HostUnusualDiskWriteLatency
    expr: (rate(node_disk_write_time_seconds_total[1m]) / rate(node_disk_writes_completed_total[1m]) > 0.1 and rate(node_disk_writes_completed_total[1m]) > 0) 
    for: 2m
    labels:
      severity: warning
    annotations:
      summary: Host unusual disk write latency (instance {{ $labels.instance }})
      description: "Disk latency is growing (write operations > 100ms)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
  - alert: HostUnusualDiskReadLatency
    expr: (rate(node_disk_read_time_seconds_total[1m]) / rate(node_disk_reads_completed_total[1m]) > 0.1 and rate(node_disk_reads_completed_total[1m]) > 0) 
    for: 2m
    labels:
      severity: warning
    annotations:
      summary: Host unusual disk read latency (instance {{ $labels.instance }})
      description: "Disk latency is growing (read operations > 100ms)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
EOH
      }

      driver = "docker"

      config {
        image = "prom/prometheus:latest"
        args = [
          "--config.file=/etc/prometheus/prometheus.yml",
          "--storage.tsdb.path=/prometheus",
          "--storage.tsdb.retention.time=40d",
        ]
        volumes = [
          "local/nomad-alert-rules.yml:/etc/prometheus/nomad-alert-rules.yml",
          "local/prometheus.yml:/etc/prometheus/prometheus.yml",
          "/mnt/diskstation/nomad/prometheus:/prometheus"
        ]

        ports = ["prometheus_ui"]
      }

      service {
        name = "prometheus"
        tags = ["urlprefix-/",
          "homer.enable=true",
          "homer.name=Prometheus",
          "homer.service=Monitoring",
          "homer.type=Prometheus",
          "homer.logo=https://upload.wikimedia.org/wikipedia/commons/thumb/3/38/Prometheus_software_logo.svg/173px-Prometheus_software_logo.svg.png",
          "homer.target=_blank",
          "homer.url=http://${NOMAD_ADDR_prometheus_ui}",

        ]
        port = "prometheus_ui"

        check {
          name     = "prometheus_ui port alive"
          type     = "http"
          path     = "/-/healthy"
          interval = "10s"
          timeout  = "2s"
        }
      }
      resources {
        memory = 350
      }
    }
  }
}