My exometer.exs standard installation

exometer.exs

# mix.exs deps

      # start exometer; force "correct" modules due to elixometer not compiling properly
      {:elixometer, "~> 1.2"},
      {:lager, ">= 3.2.1", override: true},
      {:exometer, github: "Feuerlabs/exometer"},
      {:exometer_core, "~>1.4.0", override: true},
      {:amqp_client, git: "https://github.com/dsrosario/amqp_client.git", branch: "erlang_otp_19", override: true},
      # end exometer

# dev.exs

import_config "exometer.exs"

config :exometer_core,
  reporters: [
    exometer_report_statsd: [
      hostname: 'localhost',
      port: (System.get_env("STATSD_PORT") || "8125") |> String.to_integer()
    ],
  ]

# exometer.exs

use Mix.Config

polling_interval = 1_000
memory_stats     = ~w(atom binary ets processes total)a

config :exometer_core,
  predefined: [
    {
      ~w(app_name erlang memory)a,
      {:function, :erlang, :memory, [], :proplist, memory_stats},
      []
    },
    {
      ~w(app_name erlang statistics)a,
      {:function, :erlang, :statistics, [:'$dp'], :value, [:run_queue]},
      []
    },
  ],

  reporters: [
    exometer_report_lager: [],
  ],

  report: [
    subscribers:
      [
        {
          :exometer_report_statsd,
          [:app_name, :erlang, :memory], memory_stats, polling_interval, true
        },
        {
          :exometer_report_statsd,
          [:app_name, :erlang, :statistics], :run_queue, polling_interval, true
        },
      ]
  ]

config :elixometer,
  reporter: :exometer_report_statsd,
  env: Mix.env,
  metric_prefix: "app_name"