logstash: metric filter example

logstash_metric.conf

input {
  ## 
  ## how to feed into this input: "cat /tmp/logstash.input | pv -l -L 10000 | nc localhost  33333"
  ## 
  tcp { type => "tcp" port => 33333 }
}


filter {
  metrics {
    meter => [ "events" ]
    add_tag => "metric"
    # clear_interval => 60
  }
}
output {
  # stdout { codec => rubydebug }

  if "metric" in  [tags] {
    stdout {
     codec => line { format => "count: %{events.count}  Rate: %{events.rate_1m}" }
    }
  }
}