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 OpenShift Console UI when displayed the infrastructure and application logs indicating:

__error__ JSONParserErr 
__error_details__ Value looks like object, but can't find closing '}' symbol

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:

It's observed in the Observability UI Logging that in the infrastructure and application logs inside the log in Loki is present the next two entries:

__error__    JSONParserErr
__error_details__  Value looks like object, but can't find closing '}' symbol

It could be also being observed in the next screenshot:

Expected results:

Not "{}error{} JSONParserErr" observed in the infrastructure and application logs.

Additional info:

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