feat(terraform): Refactor Prometheus

Signed-off-by: Peter Mikus <pmikus@cisco.com>
Change-Id: I47a05fc0207d691d84c6e65c7b84997edab8e272

1 files changed, 624 insertions, 0 deletions

diff --git a/fdio.infra.terraform/1n_nmd/prometheus/conf/nomad/prometheus.hcl.tftpl b/fdio.infra.terraform/1n_nmd/prometheus/conf/nomad/prometheus.hcl.tftpl
new file mode 100644
index 0000000000..224f7e5e00
--- /dev/null
+++ b/fdio.infra.terraform/1n_nmd/prometheus/conf/nomad/prometheus.hcl.tftpl
@@ -0,0 +1,624 @@
+job "${job_name}" {
+  # The "region" parameter specifies the region in which to execute the job.
+  # If omitted, this inherits the default region name of "global".
+  # region    = "${region}"
+
+  # The "datacenters" parameter specifies the list of datacenters which should
+  # be considered when placing this task. This must be provided.
+  datacenters = "${datacenters}"
+
+  # The "type" parameter controls the type of job, which impacts the scheduler's
+  # decision on placement. This configuration is optional and defaults to
+  # "service". For a full list of job types and their differences, please see
+  # the online documentation.
+  #
+  #     https://www.nomadproject.io/docs/jobspec/schedulers
+  #
+  type        = "service"
+
+  update {
+    # The "max_parallel" parameter specifies the maximum number of updates to
+    # perform in parallel. In this case, this specifies to update a single task
+    # at a time.
+    max_parallel      = ${max_parallel}
+
+    health_check      = "checks"
+
+    # The "min_healthy_time" parameter specifies the minimum time the allocation
+    # must be in the healthy state before it is marked as healthy and unblocks
+    # further allocations from being updated.
+    min_healthy_time  = "10s"
+
+    # The "healthy_deadline" parameter specifies the deadline in which the
+    # allocation must be marked as healthy after which the allocation is
+    # automatically transitioned to unhealthy. Transitioning to unhealthy will
+    # fail the deployment and potentially roll back the job if "auto_revert" is
+    # set to true.
+    healthy_deadline  = "3m"
+
+    # The "progress_deadline" parameter specifies the deadline in which an
+    # allocation must be marked as healthy. The deadline begins when the first
+    # allocation for the deployment is created and is reset whenever an allocation
+    # as part of the deployment transitions to a healthy state. If no allocation
+    # transitions to the healthy state before the progress deadline, the
+    # deployment is marked as failed.
+    progress_deadline = "10m"
+
+%{ if use_canary }
+    # The "canary" parameter specifies that changes to the job that would result
+    # in destructive updates should create the specified number of canaries
+    # without stopping any previous allocations. Once the operator determines the
+    # canaries are healthy, they can be promoted which unblocks a rolling update
+    # of the remaining allocations at a rate of "max_parallel".
+    #
+    # Further, setting "canary" equal to the count of the task group allows
+    # blue/green deployments. When the job is updated, a full set of the new
+    # version is deployed and upon promotion the old version is stopped.
+    canary            = ${canary}
+
+    # Specifies if the job should auto-promote to the canary version when all
+    # canaries become healthy during a deployment. Defaults to false which means
+    # canaries must be manually updated with the nomad deployment promote
+    # command.
+    auto_promote      = ${auto_promote}
+
+    # The "auto_revert" parameter specifies if the job should auto-revert to the
+    # last stable job on deployment failure. A job is marked as stable if all the
+    # allocations as part of its deployment were marked healthy.
+    auto_revert       = ${auto_revert}
+%{ endif }
+  }
+
+  # The "group" stanza defines a series of tasks that should be co-located on
+  # the same Nomad client. Any task within a group will be placed on the same
+  # client.
+  #
+  #     https://www.nomadproject.io/docs/job-specification/group
+  #
+  group "${job_name}-group-1" {
+    # The "count" parameter specifies the number of the task groups that should
+    # be running under this group. This value must be non-negative and defaults
+    # to 1.
+    count = ${group_count}
+
+    # The volume stanza allows the group to specify that it requires a given
+    # volume from the cluster. The key of the stanza is the name of the volume
+    # as it will be exposed to task configuration.
+    #
+    # https://www.nomadproject.io/docs/job-specification/volume
+    %{ if use_host_volume }
+    volume "${job_name}-volume-1" {
+      type      = "host"
+      read_only = false
+      source    = "${volume_source}"
+    }
+    %{ endif }
+
+    # The restart stanza configures a tasks's behavior on task failure. Restarts
+    # happen on the client that is running the task.
+    #
+    # https://www.nomadproject.io/docs/job-specification/restart
+    #
+    restart {
+      interval  = "30m"
+      attempts  = 40
+      delay     = "15s"
+      mode      = "delay"
+    }
+
+    # The constraint allows restricting the set of eligible nodes. Constraints
+    # may filter on attributes or client metadata.
+    #
+    #     https://www.nomadproject.io/docs/job-specification/constraint
+    #
+    constraint {
+      attribute = "$${attr.cpu.arch}"
+      operator  = "!="
+      value     = "arm64"
+    }
+
+    constraint {
+      attribute = "$${node.class}"
+      value     = "builder"
+    }
+
+    # The network stanza specifies the networking requirements for the task
+    # group, including the network mode and port allocations. When scheduling
+    # jobs in Nomad they are provisioned across your fleet of machines along
+    # with other jobs and services. Because you don't know in advance what host
+    # your job will be provisioned on, Nomad will provide your tasks with
+    # network configuration when they start up.
+    #
+    #     https://www.nomadproject.io/docs/job-specification/network
+    #
+    network {
+      port "${service_name}" {
+        static = ${port}
+        to     = ${port}
+      }
+    }
+
+    # The "task" stanza creates an individual unit of work, such as a Docker
+    # container, web application, or batch processing.
+    #
+    #     https://www.nomadproject.io/docs/job-specification/task
+    #
+    task "${job_name}-task-1" {
+      # The "driver" parameter specifies the task driver that should be used to
+      # run the task.
+      driver = "exec"
+
+    %{ if use_host_volume }
+      volume_mount {
+        volume      = "${job_name}-volume-1"
+        destination = "${volume_destination}"
+        read_only   = false
+      }
+    %{ endif }
+
+    %{ if use_vault_provider }
+      vault {
+        policies = "${vault_kv_policy_name}"
+      }
+    %{ endif }
+
+      # The "config" stanza specifies the driver configuration, which is passed
+      # directly to the driver to start the task. The details of configurations
+      # are specific to each driver, so please see specific driver
+      # documentation for more information.
+      config {
+        command         = "local/prometheus-${version}.linux-amd64/prometheus"
+        args            = [
+          "--config.file=secrets/prometheus.yml",
+          "--storage.tsdb.path=${volume_destination}prometheus/",
+          "--storage.tsdb.retention.time=7d"
+        ]
+      }
+
+      # The artifact stanza instructs Nomad to fetch and unpack a remote resource,
+      # such as a file, tarball, or binary. Nomad downloads artifacts using the
+      # popular go-getter library, which permits downloading artifacts from a
+      # variety of locations using a URL as the input source.
+      #
+      #     https://www.nomadproject.io/docs/job-specification/artifact
+      #
+      artifact {
+        source = "${url}"
+      }
+
+      # The "template" stanza instructs Nomad to manage a template, such as
+      # a configuration file or script. This template can optionally pull data
+      # from Consul or Vault to populate runtime configuration data.
+      #
+      #     https://www.nomadproject.io/docs/job-specification/template
+      #
+      template {
+        change_mode     = "noop"
+        change_signal   = "SIGINT"
+        destination     = "secrets/alerts.yml"
+        left_delimiter  = "{{{"
+        right_delimiter = "}}}"
+        data            = <<EOH
+---
+groups:
+- name: "Jenkins Job Health Exporter"
+  rules:
+  - alert: JenkinsJobHealthExporterFailures
+    expr: jenkins_job_failure{id=~".*"} > jenkins_job_success{id=~".*"}
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Jenkins Job Health detected high failure rate on jenkins jobs."
+      description: "Job: {{ $labels.id }}"
+  - alert: JenkinsJobHealthExporterUnstable
+    expr: jenkins_job_unstable{id=~".*"} > jenkins_job_success{id=~".*"}
+    for: 0m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Jenkins Job Health detected high unstable rate on jenkins jobs."
+      description: "Job: {{ $labels.id }}"
+- name: "Consul"
+  rules:
+  - alert: ConsulServiceHealthcheckFailed
+    expr: consul_catalog_service_node_healthy == 0
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Consul service healthcheck failed (instance {{ $labels.instance }})."
+      description: "Service: `{{ $labels.service_name }}` Healthcheck: `{{ $labels.service_id }}`."
+  - alert: ConsulMissingMasterNode
+    expr: consul_raft_peers < 3
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Consul missing master node (instance {{ $labels.instance }})."
+      description: "Numbers of consul raft peers should be 3, in order to preserve quorum."
+  - alert: ConsulAgentUnhealthy
+    expr: consul_health_node_status{status="critical"} == 1
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Consul agent unhealthy (instance {{ $labels.instance }})."
+      description: "A Consul agent is down."
+- name: "Hosts"
+  rules:
+  - alert: NodeDown
+    expr: up == 0
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Prometheus target missing (instance {{ $labels.instance }})."
+      description: "A Prometheus target has disappeared. An exporter might be crashed."
+  - 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)."
+  - alert: HostOomKillDetected
+    expr: increase(node_vmstat_oom_kill[1m]) > 0
+    for: 0m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Host OOM kill detected (instance {{ $labels.instance }})."
+      description: "OOM kill detected."
+  - alert: HostMemoryUnderMemoryPressure
+    expr: rate(node_vmstat_pgmajfault[1m]) > 1000
+    for: 2m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Host memory under memory pressure (instance {{ $labels.instance }})."
+      description: "The node is under heavy memory pressure. High rate of major page faults."
+  - 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)."
+  - alert: HostRaidDiskFailure
+    expr: node_md_disks{state="failed"} > 0
+    for: 2m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Host RAID disk failure (instance {{ $labels.instance }})."
+      description: "At least one device in RAID array on {{ $labels.instance }} failed. Array {{ $labels.md_device }} needs attention and possibly a disk swap."
+  - alert: HostConntrackLimit
+    expr: node_nf_conntrack_entries / node_nf_conntrack_entries_limit > 0.8
+    for: 5m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Host conntrack limit (instance {{ $labels.instance }})."
+      description: "The number of conntrack is approching limit."
+  - alert: HostNetworkInterfaceSaturated
+    expr: (rate(node_network_receive_bytes_total{device!~"^tap.*"}[1m]) + rate(node_network_transmit_bytes_total{device!~"^tap.*"}[1m])) / node_network_speed_bytes{device!~"^tap.*"} > 0.8
+    for: 1m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Host Network Interface Saturated (instance {{ $labels.instance }})."
+      description: "The network interface {{ $labels.interface }} on {{ $labels.instance }} is getting overloaded."
+  - alert: HostSystemdServiceCrashed
+    expr: node_systemd_unit_state{state="failed"} == 1
+    for: 0m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Host SystemD service crashed (instance {{ $labels.instance }})."
+      description: "SystemD service crashed."
+  - alert: HostEdacCorrectableErrorsDetected
+    expr: increase(node_edac_correctable_errors_total[1m]) > 0
+    for: 0m
+    labels:
+      severity: info
+    annotations:
+      summary: "Host EDAC Correctable Errors detected (instance {{ $labels.instance }})."
+      description: '{{ $labels.instance }} has had {{ printf "%.0f" $value }} correctable memory errors reported by EDAC in the last 5 minutes.'
+  - alert: HostEdacUncorrectableErrorsDetected
+    expr: node_edac_uncorrectable_errors_total > 0
+    for: 0m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Host EDAC Uncorrectable Errors detected (instance {{ $labels.instance }})."
+      description: '{{ $labels.instance }} has had {{ printf "%.0f" $value }} uncorrectable memory errors reported by EDAC in the last 5 minutes.'
+- name: "Min.io"
+  rules:
+  - alert: MinioDiskOffline
+    expr: minio_offline_disks > 0
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Minio disk offline (instance {{ $labels.instance }})"
+      description: "Minio disk is offline."
+  - alert: MinioStorageSpaceExhausted
+    expr: minio_disk_storage_free_bytes / 1024 / 1024 / 1024 < 10
+    for: 2m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Minio storage space exhausted (instance {{ $labels.instance }})."
+      description: "Minio storage space is low (< 10 GB)."
+- name: "Prometheus"
+  rules:
+  - alert: PrometheusConfigurationReloadFailure
+    expr: prometheus_config_last_reload_successful != 1
+    for: 0m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Prometheus configuration reload failure (instance {{ $labels.instance }})."
+      description: "Prometheus configuration reload error."
+  - alert: PrometheusTooManyRestarts
+    expr: changes(process_start_time_seconds{job=~"prometheus|pushgateway|alertmanager"}[15m]) > 2
+    for: 0m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Prometheus too many restarts (instance {{ $labels.instance }})."
+      description: "Prometheus has restarted more than twice in the last 15 minutes. It might be crashlooping."
+  - alert: PrometheusAlertmanagerConfigurationReloadFailure
+    expr: alertmanager_config_last_reload_successful != 1
+    for: 0m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Prometheus AlertManager configuration reload failure (instance {{ $labels.instance }})."
+      description: "AlertManager configuration reload error."
+  - alert: PrometheusRuleEvaluationFailures
+    expr: increase(prometheus_rule_evaluation_failures_total[3m]) > 0
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Prometheus rule evaluation failures (instance {{ $labels.instance }})."
+      description: "Prometheus encountered {{ $value }} rule evaluation failures, leading to potentially ignored alerts."
+  - alert: PrometheusTargetScrapingSlow
+    expr: prometheus_target_interval_length_seconds{quantile="0.9"} > 60
+    for: 5m
+    labels:
+      severity: warning
+    annotations:
+      summary: "Prometheus target scraping slow (instance {{ $labels.instance }})."
+      description: "Prometheus is scraping exporters slowly."
+  - alert: PrometheusTsdbCompactionsFailed
+    expr: increase(prometheus_tsdb_compactions_failed_total[1m]) > 0
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Prometheus TSDB compactions failed (instance {{ $labels.instance }})."
+      description: "Prometheus encountered {{ $value }} TSDB compactions failures."
+  - alert: PrometheusTsdbHeadTruncationsFailed
+    expr: increase(prometheus_tsdb_head_truncations_failed_total[1m]) > 0
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Prometheus TSDB head truncations failed (instance {{ $labels.instance }})."
+      description: "Prometheus encountered {{ $value }} TSDB head truncation failures."
+  - alert: PrometheusTsdbWalCorruptions
+    expr: increase(prometheus_tsdb_wal_corruptions_total[1m]) > 0
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Prometheus TSDB WAL corruptions (instance {{ $labels.instance }})."
+      description: "Prometheus encountered {{ $value }} TSDB WAL corruptions."
+  - alert: PrometheusTsdbWalTruncationsFailed
+    expr: increase(prometheus_tsdb_wal_truncations_failed_total[1m]) > 0
+    for: 0m
+    labels:
+      severity: critical
+    annotations:
+      summary: "Prometheus TSDB WAL truncations failed (instance {{ $labels.instance }})."
+      description: "Prometheus encountered {{ $value }} TSDB WAL truncation failures."
+EOH
+      }
+
+      template {
+        change_mode     = "noop"
+        change_signal   = "SIGINT"
+        destination     = "secrets/prometheus.yml"
+        data            = <<EOH
+---
+global:
+  scrape_interval:     5s
+  scrape_timeout:      5s
+  evaluation_interval: 5s
+
+alerting:
+  alertmanagers:
+  - consul_sd_configs:
+    - server: '{{ env "NOMAD_IP_prometheus" }}:8500'
+      services: [ 'alertmanager' ]
+
+rule_files:
+  - 'alerts.yml'
+
+scrape_configs:
+
+  - job_name: 'Nomad Cluster'
+    consul_sd_configs:
+    - server: '{{ env "NOMAD_IP_prometheus" }}:8500'
+      services: [ 'nomad-client', 'nomad' ]
+    relabel_configs:
+    - source_labels: [__meta_consul_tags]
+      regex: '(.*)http(.*)'
+      action: keep
+    metrics_path: /v1/metrics
+    params:
+      format: [ 'prometheus' ]
+
+  - job_name: 'Consul Cluster'
+    static_configs:
+      - targets: [ '10.30.51.22:8500' ]
+      - targets: [ '10.30.51.24:8500' ]
+      - targets: [ '10.30.51.25:8500' ]
+      - targets: [ '10.30.51.26:8500' ]
+      - targets: [ '10.30.51.28:8500' ]
+      - targets: [ '10.30.51.29:8500' ]
+      - targets: [ '10.30.51.30:8500' ]
+      - targets: [ '10.30.51.39:8500' ]
+      - targets: [ '10.30.51.40:8500' ]
+      - targets: [ '10.30.51.50:8500' ]
+      - targets: [ '10.30.51.51:8500' ]
+      - targets: [ '10.30.51.65:8500' ]
+      - targets: [ '10.30.51.66:8500' ]
+      - targets: [ '10.30.51.67:8500' ]
+      - targets: [ '10.30.51.68:8500' ]
+      - targets: [ '10.30.51.70:8500' ]
+      - targets: [ '10.30.51.71:8500' ]
+      - targets: [ '10.32.8.14:8500' ]
+      - targets: [ '10.32.8.15:8500' ]
+      - targets: [ '10.32.8.16:8500' ]
+      - targets: [ '10.32.8.17:8500' ]
+    metrics_path: /v1/agent/metrics
+    params:
+      format: [ 'prometheus' ]
+
+  - job_name: 'Blackbox Exporter (icmp)'
+    static_configs:
+      - targets: [ 'gerrit.fd.io' ]
+      - targets: [ 'jenkins.fd.io' ]
+      - targets: [ '10.32.8.17' ]
+    params:
+      module: [ 'icmp_v4' ]
+    relabel_configs:
+      - source_labels: [__address__]
+        target_label: __param_target
+      - source_labels: [__param_target]
+        target_label: instance
+      - target_label: __address__
+        replacement: localhost:9115
+    metrics_path: /probe
+
+  - job_name: 'Blackbox Exporter (http)'
+    static_configs:
+      - targets: [ 'gerrit.fd.io' ]
+      - targets: [ 'jenkins.fd.io' ]
+    params:
+      module: [ 'http_2xx' ]
+    relabel_configs:
+      - source_labels: [__address__]
+        target_label: __param_target
+      - source_labels: [__param_target]
+        target_label: instance
+      - target_label: __address__
+        replacement: localhost:9115
+    metrics_path: /probe
+
+  - job_name: 'Jenkins Job Health Exporter'
+    static_configs:
+      - targets: [ '10.30.51.22:9186' ]
+    metric_relabel_configs:
+      - source_labels: [ __name__ ]
+        regex: '^(vpp.*|csit.*)_(success|failure|total|unstable|reqtime_ms)$'
+        action: replace
+        replacement: '$1'
+        target_label: id
+      - source_labels: [ __name__ ]
+        regex: '^(vpp.*|csit.*)_(success|failure|total|unstable|reqtime_ms)$'
+        replacement: 'jenkins_job_$2'
+        target_label: __name__
+
+  - job_name: 'Node Exporter'
+    static_configs:
+      - targets: [ '10.30.51.22:9100' ]
+      - targets: [ '10.30.51.24:9100' ]
+      - targets: [ '10.30.51.25:9100' ]
+      - targets: [ '10.30.51.26:9100' ]
+      - targets: [ '10.30.51.28:9100' ]
+      - targets: [ '10.30.51.29:9100' ]
+      - targets: [ '10.30.51.30:9100' ]
+      - targets: [ '10.30.51.39:9100' ]
+      - targets: [ '10.30.51.40:9100' ]
+      - targets: [ '10.30.51.50:9100' ]
+      - targets: [ '10.30.51.51:9100' ]
+      - targets: [ '10.30.51.65:9100' ]
+      - targets: [ '10.30.51.66:9100' ]
+      - targets: [ '10.30.51.67:9100' ]
+      - targets: [ '10.30.51.68:9100' ]
+      - targets: [ '10.30.51.70:9100' ]
+      - targets: [ '10.30.51.71:9100' ]
+      - targets: [ '10.32.8.14:9100' ]
+      - targets: [ '10.32.8.15:9100' ]
+      - targets: [ '10.32.8.16:9100' ]
+      - targets: [ '10.32.8.17:9100' ]
+
+  - job_name: 'Alertmanager'
+    consul_sd_configs:
+    - server: '{{ env "NOMAD_IP_prometheus" }}:8500'
+      services: [ 'alertmanager' ]
+
+  - job_name: 'Grafana'
+    consul_sd_configs:
+    - server: '{{ env "NOMAD_IP_prometheus" }}:8500'
+      services: [ 'grafana' ]
+
+  - job_name: 'Prometheus'
+    consul_sd_configs:
+    - server: '{{ env "NOMAD_IP_prometheus" }}:8500'
+      services: [ 'prometheus' ]
+
+  - job_name: 'Minio'
+    bearer_token: eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJleHAiOjQ3NjQ1ODEzMzcsImlzcyI6InByb21ldGhldXMiLCJzdWIiOiJtaW5pbyJ9.oeTw3EIaiFmlDikrHXWiWXMH2vxLfDLkfjEC7G2N3M_keH_xyA_l2ofLLNYtopa_3GCEZnxLQdPuFZrmgpkDWg
+    consul_sd_configs:
+    - server: '{{ env "NOMAD_IP_prometheus" }}:8500'
+      services: [ 'storage' ]
+    metrics_path: /minio/prometheus/metrics
+
+  - job_name: 'Minio Proxy'
+    bearer_token: eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJleHAiOjQ3OTAwNjE1NDIsImlzcyI6InByb21ldGhldXMiLCJzdWIiOiJBS0lBUTJBSDdZUFBXVDZDV1hYSSJ9.CU9x9j-yO0_Uta5iep6yqNiGQPolrr2608E3lpU6Yg21rIv_eOwS5zqzXaSvrhzkJP9H5kO1Pj6kqjYhbqjN_w
+    consul_sd_configs:
+    - server: '{{ env "NOMAD_IP_prometheus" }}:8500'
+      services: [ 'minio' ]
+    metrics_path: /minio/v2/metrics/cluster
+EOH
+      }
+
+      # The service stanza instructs Nomad to register a service with Consul.
+      #
+      #     https://www.nomadproject.io/docs/job-specification/service
+      #
+      service {
+        name       = "${service_name}"
+        port       = "${service_name}"
+        tags       = [ "${service_name}$${NOMAD_ALLOC_INDEX}" ]
+        check {
+          name     = "Prometheus Check Live"
+          type     = "http"
+          path     = "/-/healthy"
+          interval = "10s"
+          timeout  = "2s"
+        }
+      }
+
+      # The "resources" stanza describes the requirements a task needs to
+      # execute. Resource requirements include memory, network, cpu, and more.
+      # This ensures the task will execute on a machine that contains enough
+      # resource capacity.
+      #
+      #     https://www.nomadproject.io/docs/job-specification/resources
+      #
+      resources {
+        cpu    = ${cpu}
+        memory = ${memory}
+      }
+    }
+  }
+}