Adding a field to be mandatory for any class of CI or the Base table cmdb_ci and if any CI misses the mandatory attribute that should reflect CMDB Completeness Dashboard - CIs Missing Required Attribute tile. It does not show the correct data even after completing the completeness schedule job and metrics from cmdb_health_metric_status, cmdb_health_processor_status.
Health inclusion rules in place for the exact class or the base table cmdb_ci.
Health Dashboard does not reflect properly if you have health inclusion rules in place for the exact class. Please remove the health inclusion rules and that should fix the issue.