class Fluent::EngineClass::NoMatchMatch

def emit(tag, es)
  # TODO use time instead of num of records
  c = (@count += 1)
  if c < 512
    if Math.log(c) / Math.log(2) % 1.0 == 0
      $log.warn "no patterns matched", :tag=>tag
      return
    end
  else
    if c % 512 == 0
      $log.warn "no patterns matched", :tag=>tag
      return
    end
  end
  $log.on_trace { $log.trace "no patterns matched", :tag=>tag }
end