Symptoms:
During the upgrade scenario of SDDC MP from older version to 8.6 version, the "Reset default content" checkbox was not selected and hence it resulted in the vRA 8.x health object missing from the Environment view.
After upgrading the SDDC MP 8.6 with the latest SDDC MP 8.6.1 version, the issue got resolved. (with "Reset default content" check box selected)
In the SDDC adapter logs you will see these entires
2022-09-20T11:34:13,950+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: etcd-service : casHealthServices
2022-09-20T11:34:13,951+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: assessment-service : casHealthServices
2022-09-20T11:34:13,951+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: kube-proxy : casHealthServices
2022-09-20T11:34:13,951+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: private-cloud-gateway : casHealthServices
2022-09-20T11:34:13,952+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: identity-service : casHealthServices
2022-09-20T11:34:13,952+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: kube-apiserver : casHealthServices
2022-09-20T11:34:13,952+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: approval-service : casHealthServices
2022-09-20T11:34:13,952+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: lemans-gateway : casHealthServices
2022-09-20T11:34:13,952+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: kubelet-rubber-stamp : casHealthServices
2022-09-20T11:34:13,952+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: docker-artifactory : casHealthServices
2022-09-20T11:34:13,953+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: cmx-service : casHealthServices
2022-09-20T11:34:13,953+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: health-reporting-service : casHealthServices
2022-09-20T11:34:13,953+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: vRA 8.x Health : SDDC CAS World
2022-09-20T11:34:13,953+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: postgres : casHealthServices
2022-09-20T11:34:13,954+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: form-service : casHealthServices
2022-09-20T11:34:13,954+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: ingress-ctl : casHealthServices
2022-09-20T11:34:13,954+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: tango-blueprint-service : casHealthServices
2022-09-20T11:34:13,954+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: cgs-service : casHealthServices
2022-09-20T11:34:13,955+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: relocation-service : casHealthServices
2022-09-20T11:34:13,955+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: kube-controller-manager : casHealthServices
2022-09-20T11:34:13,955+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: user-profile-service : casHealthServices
2022-09-20T11:34:13,955+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: abx-service : casHealthServices
2022-09-20T11:34:13,955+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: vco : casHealthServices
2022-09-20T11:34:13,956+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: no-license : casHealthServices
2022-09-20T11:34:13,956+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: kube-flannel-ds : casHealthServices
2022-09-20T11:34:13,956+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: rabbitmq-ha : casHealthServices
2022-09-20T11:34:13,956+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: codestream : casHealthServices
2022-09-20T11:34:13,956+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: adapter-host-service : casHealthServices
2022-09-20T11:34:13,957+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: tango-vro : casHealthServices
2022-09-20T11:34:13,957+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: ebs : casHealthServices
2022-09-20T11:34:13,957+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: openfaas : casHealthServices
2022-09-20T11:34:13,957+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: extensibility-service : casHealthServices
2022-09-20T11:34:13,957+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: migration-service : casHealthServices
2022-09-20T11:34:13,957+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: proxy-service : casHealthServices
2022-09-20T11:34:13,958+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: terraform-service : casHealthServices
2022-09-20T11:34:13,958+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: docker-registry : casHealthServices
2022-09-20T11:34:13,958+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: project-service : casHealthServices
2022-09-20T11:34:13,959+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: predictable-pod-scheduler : casHealthServices
2022-09-20T11:34:13,959+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: provisioning-service : casHealthServices
2022-09-20T11:34:13,959+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: catalog-service : casHealthServices
2022-09-20T11:34:13,959+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: lemans-resources : casHealthServices
2022-09-20T11:34:13,959+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: kube-scheduler : casHealthServices
2022-09-20T11:34:13,960+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: kube-dns : casHealthServices
2022-09-20T11:34:13,960+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: siecloudadvsb.sts.in.siemens.com : CAS Server
2022-09-20T11:34:13,960+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: ui : casHealthServices
2022-09-20T11:34:13,960+0000 ERROR [Collector worker thread 10] (6316) com.vmware.adapter3.sddchealth.SDDCHealthAdapter.processData - Resource key being marked as not existing is: hcmp-service : casHealthService
No data is available for vRA 8.x in the SDDC Health Dashboard