okd/roles/openshift_hosted_logging/vars/main.yaml

kh_kv: KIBANA_HOSTNAME={{ openshift_hosted_logging_hostname | quote }}
es_cs_kv: ES_CLUSTER_SIZE={{ openshift_hosted_logging_elasticsearch_cluster_size | quote }}
pmu_kv: PUBLIC_MASTER_URL={{ openshift_hosted_logging_master_public_url | quote }}
ip_kv: "{{ 'IMAGE_PREFIX=' ~ target_registry | quote if target_registry is defined else '' }}"
oc_process_values: "{{ kh_kv }} {{ es_cs_kv }} {{ pmu_kv }} {{ ip_kv }}"