input { http {} }
filter {
  sleep { time => 1 id => "λ" }
  sleep { time => 1 id => "übermäßig" }
  sleep { time => 1 id => "renè" }
}
output { }

[2024-02-12T11:46:20,950][ERROR][logstash.agent           ] Failed to execute action 
{:action=>LogStash::PipelineAction::Create/main,
 :exception=>"ArgumentError",
 :message=>"invalid byte sequence in US-ASCII",
 :backtrace=>[
    "org/jruby/RubySymbol.java:450:in `inspect'"
    "org/jruby/RubySymbol.java:440:in `inspect'"
    "org/jruby/RubyArray.java:1876:in `inspect'"
    "org/logstash/execution/AbstractPipelineExt.java:540:in `initialize_flow_metrics'"
    "/opt/logstash-8.11.1/logstash-core/lib/logstash/java_pipeline.rb:127:in `start'"
    "/opt/logstash-8.11.1/logstash-core/lib/logstash/pipeline_action/create.rb:51:in `block in execute'"
    "/opt/logstash-8.11.1/logstash-core/lib/logstash/pipelines_registry.rb:159:in `create_pipeline'"
    "/opt/logstash-8.11.1/logstash-core/lib/logstash/pipeline_action/create.rb:50:in `execute'"
    "/opt/logstash-8.11.1/logstash-core/lib/logstash/agent.rb:386:in `block in converge_state'"]
}