| ```release-note:note | |
| spanner: `num_nodes` will become a required field in the next major release and a value has to be set on `google_spanner_instance`. It will also conflict with the new field `processing_units`. | |
| ``` | |
| ```release-note:enhancement | |
| spanner: added `processing_units` to `google_spanner_instance`. | |
| ``` |