class ElasticAPM::Agent

def self.start(config)
  return @instance if @instance
  config = Config.new(config) unless config.is_a?(Config)
  LOCK.synchronize do
    return @instance if @instance
    unless config.enabled?
      config.logger.debug format(
        "%sAgent disabled with `enabled: false'",
        Logging::PREFIX
      )
      return
    end
    @instance = new(config).start
  end
end