Cluster is upgraded from 4.18 to 4.19.2
COO 1.2 is installed.
Loki is installed.

LoggingUI plugin is installed.

Project admin can access the application logs under Developer view Observe/Log.

After migration to 4.19 user gets in the Administration view Observe/Log.

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Missing permissions to get logs

Ask your administrator to grant you this role:
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: view-application-logs
  namespace: <project-name>
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-logging-application-view
subjects:

• kind: User
    name: <testuser>
    apiGroup: rbac.authorization.k8s.io