It is just meta package which depends on Feuerlabs/exometer_core, travelping/exometer_influxdb and configures some VM metrics:

• Erlang release version number
• BEAM start and uptime
• Port information
• Processes information
• Processors information 7DD7
• Garabage collection
• I/O
• Memory usage
• Scheduler usage

You can see the created metrics in config/config.exs. Note that the metrics are only created. If you want to expose them via a reporter then you need to subscribe to them from within your application.

xerions/metricman 
`--> travelping/exometer_influxdb
     `--> Feuerlabs/exometer_core
         `--> basho/lager
         |    `--> DeadZen/goldrush
         `--> uwiger/parse_trans
         |    `--> uwiger/edown
         `--> eproxus/meck
         `--> boundary/folsom
         |    `--> boundary/bear
         `--> uwiger/setup
         |    `--> uwiger/edown
     `--> benoitc/hackney
         `--> benoitc/erlang-idna
         `--> benoitc/mimerl
         `--> benoitc/metrics
         `--> certifi/erlang-certifi
         `--> deadtrickster/ssl_verify_hostname
`--> ferd/recon

1. Add metricman to your list of dependencies in mix.exs:

   def deps do
       [{:metricman, github: "xerions/metricman"}]
   end

2. Ensure metricman is started before your application:

   def application do
       [applications: [:metricman]]
   end

3. Include the metricman configuration to your config.exs:

   try do 
       import_config "../deps/metricman/config/config.exs"
   rescue
       _  in _ -> :skip
   end

4. And you can add your own exometer reporter in your config.exs:

   config :exometer_core, :report,
       reporters: [
           {:exometer_report_influxdb, [{:protocol, :http},
                                        {:host, "localhost"},
                                        {:port, 8086},
                                        {:db, "exometer"},
                                        {:tags, [{:region, :ru}]}]}
       ]

   or for InfluxDB you can use conform config:

   influx.db = http://127.0.0.1:8086/default_db
   influx.tags = node:node_name,region:de
   influx.batch_window_size = 50
   

   See this for more information about configuring the reportes plugins.