class ElasticAPM::Metrics::Registry

def define_sets
  # Only set the @sets once, in case we stop
  # and start again.
  return unless @sets.nil?
  sets = {
    system: CpuMemSet,
    vm: VMSet,
    breakdown: BreakdownSet,
    transaction: TransactionSet
  }
  if defined?(JVMSet)
    debug "Enabling JVM metrics collection"
    sets[:jvm] = JVMSet
  end
  @sets = sets.each_with_object({}) do |(key, kls), _sets_|
    debug "Adding metrics collector '#{kls}'"
    _sets_[key] = kls.new(config)
  end
end