Description of problem:

When it's configured Logging v6.2 for log forwarding to Loki v6.2 using OTLP as documented [0], it's observed in the collector logs a warning where the outputs are not consumed like below:

$ oc logs collector-g22bc 
Creating the directory used for persisting Vector state /var/lib/vector/openshift-logging/collector
Starting Vector process...
2025-03-03T16:31:26.841958Z  WARN vector::config::loading: Transform "output_loki_otlp_application_reroute._unmatched" has no consumers
2025-03-03T16:31:26.842014Z  WARN vector::config::loading: Transform "output_loki_otlp_audit_reroute._unmatched" has no consumers
2025-03-03T16:31:26.842019Z  WARN vector::config::loading: Transform "output_loki_otlp_infrastructure_reroute._unmatched" has no consumers

Version-Release number of selected component (if applicable):

$ oc get csv -n openshift-logging|grep "logging"
cluster-logging.v6.2.0                  Red Hat OpenShift Logging                        6.2.0      cluster-logging.v6.1.2           Succeeded

How reproducible:

Always

Steps to Reproduce:

1. Deploy CLO v6.2 and Loki v6.2 and configure Loki with schema version v13
2. Create a clusterLogForwarder custom resource with the next yaml:

   apiVersion: observability.openshift.io/v1
   kind: ClusterLogForwarder
   metadata:
     name: collector
     namespace: openshift-logging
     annotations:
       observability.openshift.io/tech-preview-otlp-output: "enabled" 
   spec:
     serviceAccount:
       name: collector
     outputs:
     - name: loki-otlp
       type: lokiStack 
       lokiStack:
         target:
           name: logging-loki
           namespace: openshift-logging
         dataModel: Otel 
         authentication:
           token:
             from: serviceAccount
       tls:
         ca:
           key: service-ca.crt
           configMapName: openshift-service-ca.crt
     pipelines:
     - name: my-pipeline
       inputRefs:
       - application
       - infrastructure
       outputRefs:
       - loki-otlp
   

Actual results:

Logs are observed in the OpenShift UI Console

All the collector pods throw in the logs the WARN message:

$ oc logs collector-g22bc 
Creating the directory used for persisting Vector state /var/lib/vector/openshift-logging/collector
Starting Vector process...
2025-03-03T16:31:26.841958Z  WARN vector::config::loading: Transform "output_loki_otlp_application_reroute._unmatched" has no consumers
2025-03-03T16:31:26.842014Z  WARN vector::config::loading: Transform "output_loki_otlp_audit_reroute._unmatched" has no consumers
2025-03-03T16:31:26.842019Z  WARN vector::config::loading: Transform "output_loki_otlp_infrastructure_reroute._unmatched" has no consumers

Expected results:

Not expected to see any WARN related to the transforms created and not consumed

[0] https://docs.openshift.com/container-platform/4.17/observability/logging/logging-6.1/log6x-about-6.1.html#quick-start-opentelemetry_