crow_plugins supplies a number of plugins for crow. Currently, the following plugins are supplied:

• CrowPlugins.BEAM.Atoms: Counts atoms on the local node.
• CrowPlugins.BEAM.ContextSwitches: Counts context switches in the VM.
• CrowPlugins.BEAM.GarbageCollections: Counts garbage collections in the VM.
• CrowPlugins.BEAM.ETS: Instruments ETS table memory usage or item count, depending on configuration.
• CrowPlugins.BEAM.IO: Monitors bytes sent and received through ports.
• CrowPlugins.BEAM.Memory: Monitors memory usage of the VM.
• CrowPlugins.BEAM.Reductions: Monitors VM reductions.
• CrowPlugins.BEAM.SystemInfo: Monitors system counters and active sockets of the VM.

Simply add crow_plugins to your mix.exs:

def deps do
  [
    {:crow_plugins, "~> 0.2"}
  ]
end

Then configure :crow with the plugins you want, for example:

# config/config.exs
config :crow,
  ip: {127, 0, 0, 1},
  port: 4950,
  plugins: [
    CrowPlugins.BEAM.Atoms,
    CrowPlugins.BEAM.ContextSwitches,
    CrowPlugins.BEAM.GarbageCollections,
    CrowPlugins.BEAM.IO,
    CrowPlugins.BEAM.Memory,
    CrowPlugins.BEAM.Reductions,
    CrowPlugins.BEAM.SystemInfo
  ]

Documentation can be found at https://hexdocs.pm/crow_plugins.