how to Get App Information from nats?

[Load Sys]

 Hi,Guys! I  want to get app's information,such as cpu_used,memory_used,disk_used, i find two message contain app information one is dea.heartbeat the other is dea.find.droplet message,  the former only containe app's state,the later container app's resource information,following the message:

  class FindDropletResponse
    def self.generate(bootstrap, instance, request)
      response = {
        "dea"             => bootstrap.uuid,
        "droplet"         => instance.application_id,
        "version"         => instance.application_version,
        "instance"        => instance.instance_id,
        "index"           => instance.instance_index,
        "state"           => Dea::Instance::State.to_external(instance.state),
        "state_timestamp" => instance.state_timestamp,
        "staged"          => "/#{instance.instance_id}",
      }

      if request.has_key?("path")
        response["file_uri_v2"] = bootstrap.directory_server_v2.instance_file_url_for(instance.instance_id, request["path"])
      end

      if request["include_stats"] && instance.running?
        response["stats"] = {
          "name"       => instance.application_name,
          "uris"       => instance.application_uris,
          "host"       => bootstrap.local_ip,
          "port"       => instance.instance_host_port,
          "uptime"     => (Time.now - instance.state_starting_timestamp).to_i,
          "mem_quota"  => instance.memory_limit_in_bytes,
          "disk_quota" => instance.disk_limit_in_bytes,
          "fds_quota"  => instance.file_descriptor_limit,
          "usage"      => {
            "time" => Time.now.to_s,
            "cpu"  => instance.computed_pcpu,
            "mem"  => instance.used_memory_in_bytes,
            "disk" => instance.used_disk_in_bytes,
          },
          # Purposefully omitted, as I'm not sure what purpose it serves.
          # cores
        }
      end

      response
    end
  end

dea.find.droplet only return information of app instance,so why we call this message dea.find.droplet,it seem like this message is to find a droplet.

what's important. is there any way for me to get app's information conveniently? Any suggestions will be greatly appreciated.