Logstash configure error?

Elastic Stack Logstash
1

hi,

i's my logstash filter conf,like this

if [url_M] == "isOldPasswordCorrect" {

        metrics {
           meter => [ "passauth" ]
           add_tag => "metric"
          }

          if "metric" in [tags] {

                ruby {

                        code => "event.cancel if event['passauth.rate_1m']*60 < 100"

              }
                }

        }

but when i test conf,the logstash say's

Ruby exception occurred: undefined method `*' for nil:NilClass {:level=>:error}

2

The metrics filter produces nested fields and passauth.rate_1m isn't the right notation for nested fields. Try event['passauth']['rate_1m'] instead (or event['[passauth][rate_1m]'] if this is Logstash 5.0.

3

thank you for you reply!