logstash rate limiting

filter {
  if "metric" in [tags] {
     mutate { add_field => { "[@metadata][rate]" => "%{events.rate_1m}"  }
              convert   => [ "%{[@metadata][rate]}" , "integer" ]  }
  }
}


filter {
  if [@metadata][rate] > 1000 {
    drop { percentage => 95}
  } else if [@metadata][rate] > 600 {
    drop { percentage => 85 }
  } else if [@metadata][rate] > 300 {
   drop { percentage => 50 }
  } else if [@metadata][rate] > 80 {
   drop { percentage => 20 }
  } else {
   drop { percentage => 0 }
  }
}


output {
  if "metric" in [tags] {
    stdout {
      codec => line {
        format => "rate2: %{[@metadata][rate]}"
      }
    }
  }
#   stdout { codec => rubydebug }
}