CloudWatch input plugin not working with EC2 namespace

[kanny]

Hello,

When I ran Logstash 8.6.2 version to collect EC2 CloudWatch metrics, the process returned "Exception: NameError".
As far as I know by testing, this exception happends only for AWS/EC2 namespace, and setting for other namespace such as AWS/RDS works.
Logstash 7.17.9 worked with the same config file.

My issue seems the same as this post, but it was already closed without any comments.

Problems with cloudwatch input plugin - namespace AWS/EC2 NameError

Hello All, problem summary: logstash can't recognize 'AWS/EC2' I am setting up a logstash configuration file to get cloudwatch(EC2, RDS) data. I have written input plugin code as below, and RDS is working as I expected. However, EC2 part isn't working with error. I have no idea why NameError occurs only on EC2, even though it works fine on RDS. It seems that transpiled code 'Aws::EC2' is not recognized by jruby. How can I fix this error? any suggestions would be grateful. thanks for you…

Any suggestions would be greatly appreciated.

Input configuration:

input {
  cloudwatch {
    namespace => "AWS/EC2"
    metrics => [ "CPUUtilization" ]
    filters => { "tag:AutoStop"=> "false"}
    region => "ap-northeast-1"
  }
}

Error message:

[2023-03-30T12:29:19,453][ERROR][logstash.javapipeline    ][main][8624b06bdbedde7950dc9a8f04c94d2da6a631699d3e08a2ee9034935b12428b] A plugin had an unrecoverable error. Will restart this plugin.
  Pipeline_id:main
  Plugin: <LogStash::Inputs::CloudWatch namespace=>"AWS/EC2", metrics=>["CPUUtilization"], id=>"8624b06bdbedde7950dc9a8f04c94d2da6a631699d3e08a2ee9034935b12428b", region=>"ap-northeast-1", enable_metric=>true, codec=><LogStash::Codecs::Plain id=>"plain_177ff1f1-f27e-4aa3-95a5-ec3036638fa2", enable_metric=>true, charset=>"UTF-8">, role_session_name=>"logstash", statistics=>["SampleCount", "Average", "Minimum", "Maximum", "Sum"], interval=>900, period=>300, combined=>false>
  Error: uninitialized constant Aws::EC2
  Exception: NameError
  Stack: org/jruby/RubyModule.java:3963:in `const_missing'
org/jruby/RubyModule.java:3905:in `const_get'
/usr/share/logstash/vendor/bundle/jruby/2.6.0/gems/logstash-integration-aws-7.0.1/lib/logstash/inputs/cloudwatch.rb:247:in `block in clients'
org/jruby/RubyHash.java:794:in `default'
org/jruby/RubyHash.java:1265:in `[]'
/usr/share/logstash/vendor/bundle/jruby/2.6.0/gems/logstash-integration-aws-7.0.1/lib/logstash/inputs/cloudwatch.rb:316:in `resources'
/usr/share/logstash/vendor/bundle/jruby/2.6.0/gems/logstash-integration-aws-7.0.1/lib/logstash/inputs/cloudwatch.rb:179:in `from_resources'
/usr/share/logstash/vendor/bundle/jruby/2.6.0/gems/logstash-integration-aws-7.0.1/lib/logstash/inputs/cloudwatch.rb:160:in `block in run'
org/jruby/RubyArray.java:1865:in `each'
/usr/share/logstash/vendor/bundle/jruby/2.6.0/gems/logstash-integration-aws-7.0.1/lib/logstash/inputs/cloudwatch.rb:157:in `run'
/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:411:in `inputworker'
/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:402:in `block in start_input'

Thank you.