# Error while running logstash: org.logstash.instrument.metrics.gauge.LazyDelegatingGauge

**URL:** <https://discuss.elastic.co/t/error-while-running-logstash-org-logstash-instrument-metrics-gauge-lazydelegatinggauge/231552>\
**Category:** Logstash\
**Created:** [May 7, 2020, 1:43pm UTC](https://discuss.elastic.co/t/error-while-running-logstash-org-logstash-instrument-metrics-gauge-lazydelegatinggauge/231552 "2020-05-07T13:43:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![elen](https://avatars.discourse-cdn.com/v4/letter/e/f05b48/32.png) [@elen](https://discuss.elastic.co/u/elen)\
**Post date:** [May 7, 2020, 1:43pm UTC](https://discuss.elastic.co/t/error-while-running-logstash-org-logstash-instrument-metrics-gauge-lazydelegatinggauge/231552/1 "2020-05-07T13:43:31Z")

</div>

Hello,

Trying to send data Logstash -\> Elasticsearch ( both are running in docker, configs are tested and are ok) and I'm experiencing issue that actual data is not sent (this is the only warning I get while running logstash conf file):

**[2020-05-07T18:09:30,166][WARN][org.logstash.instrument.metrics.gauge.LazyDelegatingGauge][main] A gauge metric of an unknown type (org.jruby.specialized.RubyArrayOneObject) has been create for key: cluster\_uuids. This may result in invalid serialization. It is recommended to log an issue to the responsible developer/development team.**  
\*\* -----------------------------------------------------------------------\*\*

```
#logstash config file: 

input { 
file { 
       path => "/root/metricbeat.log" 
       start_position => "beginning" sincedb_path => "/dev/null" 
} 
}

filter { 
} 

output { 
       elasticsearch { hosts => ["http://localhost:9200"] 
       index => "test-logstash" 
} 
stdout {} 
}

```

* * *

I am using 7.5.1 version for elasticsearch and logstash

Thanks in advance.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 4, 2020, 1:43pm UTC](https://discuss.elastic.co/t/error-while-running-logstash-org-logstash-instrument-metrics-gauge-lazydelegatinggauge/231552/2 "2020-06-04T13:43:38Z")

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