DGX: /dgx filesystem almost full

Error message

• Deprecated function: Optional parameter $item declared before required parameter $complete_form is implicitly treated as a required parameter in include_once() (line 1439 of /prod_service02/web-prod/hpc-web/includes/bootstrap.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in css_injector_init() (line 53 of /prod_service02/web-prod/hpc-web/sites/all/modules/css_injector/css_injector.module).