[Bug] Metric Filter Events Ignore Conditionals

Elastic Stack Logstash
1

Events generated by the metrics filter ignore conditionals and execute all filters after the metrics filter.

Logstash version: 6.4.2

logstash.conf:

input {
  tcp {
    port => 11224
  }
}
filter {
  kv { }
  if 'true' {
    if 'true' {
      metrics {
	    meter => {'http_%{response}' => '%{response}'}
	    add_tag => [ 'metric1' ]
      }
    }
  }
  else if 'false' == 'true' {
    mutate { add_tag => [ 'metric2' ] }
  }
  else {
    mutate { add_tag => [ 'metric3' ] }
  }
}
output {
  stdout {
    codec => rubydebug { metadata => true }
  }
}

Expected output should contain the metric1 tag only but Logstash includes tags added in different conditional blocks:

{
               "@timestamp" => 2018-10-23T17:07:06.028Z,
    "\"http_200\", \"200\"" => {
        "rate_15m" => 0.16014748058336145,
         "rate_1m" => 0.00713479866945049,
           "count" => 1,
         "rate_5m" => 0.10268342380651842
    },
                 "@version" => "1",
                  "message" => "539d27e3f0df",
                     "tags" => [
        [0] "metric1",
        [1] "metric2",
        [2] "metric3"
    ]
}
2

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