Invalid input writing to gnocchi

if i create an instance in openstack ceilometer has problems to write to gnocchi while creating a resource.
The Error message is looks like this.

Failed to create resource {'id': '6321a81f-f53c-4856-933a-74b2558e8b30', 'host': 'compute01', 'flavor_id': 36, 'flavor_name': 'small', 'user_id': '170f0b2147544ceabf821f500f640c41', 'project_id': '8d19da7ffc594f758ccdffee624b4ed7'}: gnocchiclient.exceptions.BadRequest: {'cause': 'Invalid input', 'reason': "expected str for dictionary value @ data['flavor_id']", 'detail': ['flavor_id']} (HTTP 400)
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi Traceback (most recent call last):
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi File "/var/lib/kolla/venv/lib/python3.8/site-packages/ceilometer/publisher/gnocchi.py", line 536, in _create_event
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi self._create_resource(resource_type, resource)
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi File "/var/lib/kolla/venv/lib/python3.8/site-packages/ceilometer/publisher/gnocchi.py", line 446, in _create_resource
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi self._gnocchi.resource.create(resource_type, resource)
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi File "/var/lib/kolla/venv/lib/python3.8/site-packages/gnocchiclient/v1/resource.py", line 95, in create
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi return self._post(
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi File "/var/lib/kolla/venv/lib/python3.8/site-packages/gnocchiclient/v1/base.py", line 41, in _post
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi return self.client.api.post(*args, **kwargs)
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi File "/var/lib/kolla/venv/lib/python3.8/site-packages/keystoneauth1/adapter.py", line 401, in post
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi return self.request(url, 'POST', **kwargs)
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi File "/var/lib/kolla/venv/lib/python3.8/site-packages/gnocchiclient/client.py", line 52, in request
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi raise exceptions.from_response(resp, method)
2022-04-25 10:48:41.024 68 ERROR ceilometer.publisher.gnocchi gnocchiclient.exceptions.BadRequest: {'cause': 'Invalid input', 'reason': "expected str for dictionary value @ data['flavor_id']", 'detail': ['flavor_id']} (HTTP 400)

i tried to debug the this a bit and saw that in the json
Failed to create resource {'id': '6321a81f-f53c-4856-933a-74b2558e8b30', 'host': 'compute01', 'flavor_id': 36, 'flavor_name': 'small', 'user_id': '170f0b2147544ceabf821f500f640c41', 'project_id': '8d19da7ffc594f758ccdffee624b4ed7'}

the flavor_id is not a string and on top of that it is not the correct ID of the flavor.