TASK [Set info for previous postgres pod] **************************************
task path: /opt/ansible/roles/installer/tasks/database_configuration.yml:130
ok: [localhost] => {"ansible_facts": {"sorted_old_postgres_pods": "<list_reverseiterator object at 0x7f512f251fd0>"}, "changed": false}

TASK [Set info for previous postgres pod] **************************************
task path: /opt/ansible/roles/installer/tasks/database_configuration.yml:138
ok: [localhost] => {"ansible_facts": {"old_postgres_pod": "<"}, "changed": false}

(...)

TASK [postgres : Get old PostgreSQL version] ***********************************
task path: /opt/ansible/roles/installer/tasks/database_configuration.yml:159
fatal: [localhost]: FAILED! => {
    "msg": "The task includes an option with an undefined variable. The error was: 'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'metadata'\n\nThe error appears to be in '/opt/ansible/roles/installer/tasks/database_configuration.yml': line 159, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: Get old PostgreSQL version\n      ^ here\n"