Horizon Cloud comes with an Enterprise-grade+ 99.9% availability SLA, 24-7 support from VMware for the Horizon Cloud service
Horizon Cloud on Azure: https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/support/vmware-horizon-cloud-on-azure-service-level-agt.pdf
Horizon Cloud Hosted: https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/support/vmware-horizon-cloud-hosted-sla.pdf
VMware Cloud on AWS: https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/support/vmw-cloud-aws-service-level-agreement.pdf