Get Dashboard Item Property Keys

Returns the keys of all properties for a dashboard item.This operation can be accessed anonymously.**[Permissions](#permissions) required:** The user must be the owner of the dashboard or have the dashboard shared with them. Note, users with the *Administer Jira* [global permission](https://confluence.atlassian.com/x/x4dKLg) are considered owners of the System dashboard. The System dashboard is considered to be shared with all other users, and is accessible to anonymous users ...