UsageData Usage details about the volume. This information is used by the GET /system/df endpoint, and omitted in other endpoints.
| Name | Type | Description | Notes |
|---|---|---|---|
| refCount | Long | The number of containers referencing this volume. This field is set to `-1` if the reference-count is not available. | |
| size | Long | Amount of disk space used by the volume (in bytes). This information is only available for volumes created with the `"local"` volume driver. For volumes created with other volume drivers, this field is set to `-1` ("not available") |
- Serializable