Event.set does not work

Elastic Stack Logstash
1

Hello, I'm trying to create new field in my filter, but seems that event.set does not work properly. I can't see neither errors nor the new fields in elastic.

I had to add the if condition since the field is not contained in all the document. How can I add the new derived field?

ruby {
        init => "require 'time'"
        code => "
                 duration = (event.get('@timestamp').to_i - event.get('start_date').to_i)/60/60;
                 event.set('system.process.cpu.duration', duration);
                 if event.get('system.filesystem.free') != nil
                        fs_gb = event.get('system.filesystem.free') / (1024*1024*1024);
                        event.set('system.filesystem.free_gb', fs_gb);
                 end
                 if event.get('system.cpu.total.pct') != nil
                        cpu_pct = event.get('system.cpu.total.pct') * 100;
                        event.set('system.cpu.total.pct_100', cpu_pct);
                 end
                 if !event.get('system.cpu.total.pct').nil?; event.set('cpu_pct',event.get('system.cpu.total.pct') * 100);end
                "
    }

Consider that only system.process.cpu.duration is set properly

2

If that is coming from metricbeat you would have to use

 if event.get('[system][filesystem][free]')

and so on. logstash does not use the naming convention for fields inside objects that beats and elasticsearch use.

3

I'm making the same exercise for an aws rds metric, but it is not work. Here is the configuration. Are this module has a different syntax?

 if event.get('[aws][rds][free_storage][bytes]') != nil
                                rds_free_gb = event.get('[aws][rds][free_storage][bytes]') / (1024*1024*1024);
                                event.set('[aws][rds][free_storage][gb]', rds_free_gb);
                          end
4

Enyone faced the same issue with this metricbeat module? How could I read the incoming events to check the syntax?

5

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