https://access.redhat.com/documentation/en-us/red_hat_data_grid/7.3/html/red_hat_data_grid_for_openshift/os_templates#os_templates_rhdg_import
The procedure in 9.2. Importing Deployment Configuration Templates shows broken links to the DG templates. The 7.3-v1.9 tag doesn't exist and the DG 7 templates are deprecated. https://github.com/jboss-container-images/jboss-datagrid-7-openshift-image/commit/0fd0cae321ba9b195014e7366246c8a78ce5bad9 This information is included in the preceding chapter 9.1. Data Grid Deployment Configuration Templates.

We should point to 7.3-v1.8 tag.