Generally available: Azure SignalR Service Premium Tier

Azure SignalR Service Premium Tier is now generally available. This plan provides greater resiliency, scalability, and flexibility by enabling key features, including:

• An SLA including 99.95% availability.
• Availability Zone support: Distribute workloads evenly across multiple zones in a supported Azure region and redirecting traffic to other zones in the event of a failure.
• Autoscale capabilities: Specify rules that make it easy scale up and down to meet capacity needs and optimize resource usage. 
• Custom domain support: Add your desired custom domain names to your application.