Warning [org.logstash.instrument.metrics.gauge.LazyDelegatingGauge] after updating to 7.16.1

[d71247 (firas)]

Hello,
I just updated my Logstash to 7.16.1... but I noticed warning in my conf when starting Logstash.
the same conf of Logstash works well in version 7.9.1
How do to fix this warning ?

I am using a Logstash docker image: 7.16.1

[WARN ][org.logstash.instrument.metrics.gauge.LazyDelegatingGauge][log_matchportail] A gauge metric of an unknown type (org.jruby.specialized.RubyArrayOneObject) has been created for key: send_to. This may result in invalid serialization. It is recommended to log an issue to the responsible developer/development team.

[yaauie (Ry Biesemeyer)]

looks like an occurrance of Warning in logs => A gauge metric of an unknown type (org.jruby.specialized.RubyArrayOneObject) has been created for key: send_to · Issue #13106 · elastic/logstash · GitHub and can safely be ignored.