REST API使用時にCinderドライバが正しく初期化されない

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環境

Antelope をベースにした RHOSO 18（RedHat Openstack on OpenShift）
Cinder ドライバ
NetApp Data ONTAP 9.16
iSCSIプロトコル

問題

cinder バックエンドがパラメーター netapp_use_legacy_client = False で構成されている場合、cinder ドライバーは正しく初期化されません：

YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager [None req-f2de927d-cbb9-4979-9dda-ae6264430ca9 - - - - - -] Failed to initialize driver.: cinder.exception.NotFound: Counter avg_processor_busy not found
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager Traceback (most recent call last):
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager File "/usr/lib/python3.9/site-packages/cinder/volume/drivers/netapp/dataontap/client/client_cmode_rest.py", line 926, in get_performance_counter_info
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager    response = self.send_request(
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager File "/usr/lib/python3.9/site-packages/cinder/volume/volume_utils.py", line 1565, in trace_method_logging_wrapper
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager    return f(*args, **kwargs)
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager File "/usr/lib/python3.9/site-packages/cinder/volume/drivers/netapp/dataontap/client/client_cmode_rest.py", line 231, in send_request
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager    response = self.get_records(
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager File "/usr/lib/python3.9/site-packages/cinder/volume/volume_utils.py", line 1565, in trace_method_logging_wrapper
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager    return f(*args, **kwargs)
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager File "/usr/lib/python3.9/site-packages/cinder/volume/drivers/netapp/dataontap/client/client_cmode_rest.py", line 261, in get_records
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager    _, response = self.connection.invoke_successfully(
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager File "/usr/lib/python3.9/site-packages/cinder/volume/drivers/netapp/dataontap/client/api.py", line 874, in invoke_successfully
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager    raise NaApiError(code, msg)
YYYY-MM-DD hh:mm:ss ERROR cinder.volume.manager cinder.volume.drivers.netapp.dataontap.client.api.NaApiError: NetApp API failed. Reason - 8585320:Object "system:constituent" was not found.