LeonD9

It seems its an issue related to fluent-plugin-opensearch latest version, reverted to 1.0.2 fixed my issue.

@cosmo0920 @ryn9 did you guys also see this warning message in 1.0.2 gem: ```2022-04-04 07:15:53 +0000 [warn]: #0 emit transaction failed: error_class=NoMethodError error="undefined method `+' for nil:NilClass" location="/fluentd/vendor/bundle/ruby/2.6.0/gems/fluentd-1.14.3/lib/fluent/plugin/output.rb:1341:in `submit_flush_once'" tag="kubernetes.var.log.containers.kube-metrics-adapter-6f75fbbbc4-s5smw_kube-system_kube-metrics-adapter-ee0fb2300dec03ae655ae7ad6e094e98dcebb26b61ac9e0213647a9cb015f763.log"...

@cosmo0920 the same as this issue: https://github.com/fluent/fluentd/issues/1973 there is no more logs except this in debug/trace mode: ``` 2022-04-16 19:25:26 +0000 [trace]: #0 [main-logs] writing events into buffer instance=458700 metadata_size=1...