[BUG] Rancher-Logging v104.1.0+up4.8.0 breaks GELF Output!

[MSandro]

Rancher Server Setup

• Rancher version: 2.9.1
• Installation option (Docker install/Helm Chart): Helm Chart
  • If Helm Chart, Kubernetes Cluster and version (RKE1, RKE2, k3s, EKS, etc): RKE1
• Proxy/Cert Details:

Information about the Cluster

• Kubernetes version: v1.28.11
• Cluster Type (Local/Downstream): Downstream
  • If downstream, what type of cluster? (Custom/Imported or specify provider for Hosted/Infrastructure Provider): Custom

User Information

• What is the role of the user logged in? (Admin/Cluster Owner/Cluster Member/Project Owner/Project Member/Custom)
  • If custom, define the set of permissions: Admin

Describe the bug

We are using Rancher-Logging since the cluster exists with GrayLog GELF Output. Now since v104.1.0+up4.8.0 the rancher-logging-root-fluentd-configcheck pod fails whit this error:

[error]: config error file="/fluentd/etc/fluent.conf" error_class=Fluent::ConfigError error="this plugin 'Fluent::GELFOutput' cannot handle arguments for <buffer ...> section"

To Reproduce

1. install Rancher-Logging
2. setup a output:

apiVersion: logging.banzaicloud.io/v1beta1
kind: Output
metadata:
  name: graylog-prod-edm
  namespace: edm
spec:
  gelf:
    host: 172.27.130.101
    port: 12201
    protocol: tcp
    tls_options: {}

3. setup a flow:

apiVersion: logging.banzaicloud.io/v1beta1
kind: Flow
metadata:
  name: edm
  namespace: edm
spec:
  globalOutputRefs: []
  localOutputRefs:
    - graylog-prod-edm

Result the rancher-logging-root-fluentd-configcheck pod fails whit this error:

[error]: config error file="/fluentd/etc/fluent.conf" error_class=Fluent::ConfigError error="this plugin 'Fluent::GELFOutput' cannot handle arguments for <buffer ...> section"

Expected Result

the rancher-logging-root-fluentd-configcheck pod should exit successfully like in the previous version v104.0.0+up4.4.0