[ideaship]

When OSISM deploys Ceph, it creates the Gnocchi pool as metrics (openstack_gnocchi_pool in 099-ceph.yml) and grants client.gnocchi access to that pool only. Kolla renders gnocchi.conf's ceph_pool from ceph_gnocchi_pool_name, whose upstream default (mirrored in 001-ceph.yml) is gnocchi. So unless the configuration repository overrides the name, Gnocchi points at a pool OSISM does not create and its key cannot access. It is the only one of the five OpenStack pools whose names differ. cfg-cookiecutter has carried ceph_gnocchi_pool_name: "metrics" since 2020 to cover this, and configuration repositories copy it.

This derives ceph_gnocchi_pool_name from openstack_gnocchi_pool.name when OSISM deploys Ceph, using the same signal as the Ceph mgr exporter (a non-empty ceph-mgr group). With an external Ceph cluster OSISM creates no pools, so the name stays at upstream's gnocchi.

Repositories generated from cfg-cookiecutter already set metrics, so their effective value does not change. Once a release carries this, the template line is a restatement and can go.

Testing

• Resolved with ansible against this tree: metrics with a ceph-mgr host, gnocchi with an empty ceph-mgr group. A site's own ceph_gnocchi_pool_name, or a renamed openstack_gnocchi_pool, wins in both cases.
• On a 2026.1 cluster that deploys Ceph with cephadm, with the configuration repository's ceph_gnocchi_pool_name removed: osism apply -a config gnocchi renders ceph_pool = gnocchi with the previous defaults and ceph_pool = metrics with this change.
• Checks: yamllint passes, and the kolla drift detector reports nothing to act on.

🤖 Generated with Claude Code