Hi, some volumes are stored with the volume_type Id instead of the volume_type name: openstack metric resource history --details b5496a42-c766-4267-9248-6149aa9dd483 -c id -c revision_start -c revision_end -c instance_id -c volume_type +--------------------------------------+----------------------------------+----------------------------------+--------------------------------------+--------------------------------------+ | id | revision_start | revision_end | instance_id | volume_type | +--------------------------------------+----------------------------------+----------------------------------+--------------------------------------+--------------------------------------+ | b5496a42-c766-4267-9248-6149aa9dd483 | 2019-05-08T07:21:35.354474+00:00 | 2019-05-21T09:18:32.767426+00:00 | 662998da-c3d1-45c5-9120-2cff6240e3b6 | v-ssd-std | | b5496a42-c766-4267-9248-6149aa9dd483 | 2019-05-21T09:18:32.767426+00:00 | 2019-05-21T09:18:32.845700+00:00 | 662998da-c3d1-45c5-9120-2cff6240e3b6 | v-ssd-std | | b5496a42-c766-4267-9248-6149aa9dd483 | 2019-05-21T09:18:32.845700+00:00 | None | 662998da-c3d1-45c5-9120-2cff6240e3b6 | 8bd7e1b1-3396-49bf-802c-8c31a9444895 | +--------------------------------------+----------------------------------+----------------------------------+--------------------------------------+--------------------------------------+ I was not able to find anything fishy in ceilometer. So I guess it could be some event/notification with a wrong payload? Could anyone please verify this error is not uniq to our (rocky) environment by running: openstack metric resource list --type volume -c id -c volume_type All the best, Florian