Support Debian packages about puppet-prometheus HOT 5 OPEN

class profile::prometheus::server {
  class {
    'prometheus::server':
      # no static scrape configurations, collect everything from other jobs
      scrape_configs      => [],
      collect_scrape_jobs => [ { 'job_name' => 'prometheus-node-exporter' } ],
      # follow prom2 defaults
      localstorage        => '/var/lib/prometheus/metrics2',
      storage_retention   => '15d',
  }
  # [...] webserver proxy configuration, authentication and firewall rule exports
}

class profile::prometheus::client(
  Enum['present', 'absent'] $ensure = 'present'
) {
  $package_ensure = $ensure ? { 'present' => 'latest', 'absent' => 'absent' }
  $service_ensure = $ensure ? { 'present' => 'running', 'absent'  => 'stopped' }
  class { 'prometheus::node_exporter':
    install_method => 'package',
    package_name   => 'prometheus-node-exporter',
    package_ensure => $package_ensure,
    service_ensure => $service_ensure,
    # purge_config_dir => true,
  }
  # XXX: should be using apt::pin, but that involves replacing a lot
  # of our custom code
  file {
    '/etc/apt/preferences.d/prometheus-node-exporter.pref':
      ensure  => present,
      content => "# this file is managed through puppet, local changes will be lost
Explanation: Prometheus 2.x is not in Debian stretch, remove when we move to buster
Package: prometheus-node-exporter
Pin: release n=stretch-backports
Pin-Priority: 500
",
      notify  => Package[$::prometheus::node_exporter::package_name],
  }
  # [...] firewall rules
}

  class {
    'prometheus::server':
      # collect everything from node and apache jobs.
      #
      # when a new job is added here, usually the
      # profile::prometheus::server::rule below also needs to be
      # updated.
      collect_scrape_jobs => $collect_scrape_jobs,
      # monitor prometheus and grafana as well
      scrape_configs      => $scrape_configs,
      storage_retention   => $storage_retention,
      global_config       => lookup('prometheus::global_config') + { 'scrape_interval' => $scrape_interval },
      # follow prom2 defaults
      localstorage        => '/var/lib/prometheus/metrics2',
      # force debian package install parameters, further discussion in:
      # https://github.com/voxpupuli/puppet-prometheus/pull/303
      env_file_path       => '/etc/default',
      bin_dir             => '/usr/bin',
      configname          => 'prometheus.yml',
      install_method      => 'package',
      package_ensure      => 'present', # don't upgrade package through puppet
      init_style          => 'none',
      shared_dir          => '/usr/share/prometheus',
  }

  class { 'prometheus::blackbox_exporter':
    package_ensure    => $package_ensure,
    service_ensure    => $service_ensure,
    export_scrape_job => true,
    # force debian package install parameters, further discussion in:
    # https://github.com/voxpupuli/puppet-prometheus/pull/303
    install_method    => 'package',
    init_style        => 'none',
    user              => 'prometheus',
    group             => 'prometheus',
    package_name      => 'prometheus-blackbox-exporter',
    service_name      => 'prometheus-blackbox-exporter',
    # purge_config_dir => true,
    config_file       => '/etc/prometheus/blackbox-exporter.yaml',
    env_vars          => {
      'ARGS' => "--config.file='/etc/prometheus/blackbox-exporter.yaml'",
    },
  }