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`matrix_container_global_registry_prefix_override` may look similar to the old `matrix_container_global_registry_prefix` variable (removed in d6bf789710dec1567f47f5d7f3c4911ebafff9ea), but it's different. The old `matrix_container_global_registry_prefix` variable was just a hardcode of `docker.io/` and roles that needed to refer to `docker.io/` could use it. However, this was: - not used by all roles, because some need another registry (not `docker.io/`) - used only by roles within the playbook (`roles/custom`), not external roles Overriding the old `matrix_container_global_registry_prefix` variable was rather pointless, as it didn't cover everything. The new `matrix_container_global_registry_prefix_override` variable, on the other hand, lets you override the registry prefix for all components, regardless of whether they use `docker.io/` or another registry by default. This is useful to people who have somehow mirrored all container images to their own registry, as it provides them with a single variable they can flip to influence the whole playbook.