SignalR is still supported. Though yes, modern "Core SignalR" is something of a rewrite compared to older versions of SignalR, though the biggest backwards inco

SignalR is still supported. Though yes, modern "Core SignalR" is something of a rewrite compared to older versions of SignalR, though the biggest backwards incompatible changes are JS client side, not server side .NET side (most of that remains the same once you swap nuget packages), as they dropped the magic JS autogenerated client for a sometimes more sensible "Event Emitter" style client.