Looking to know more about this. Seen it popup in my admin overview…
Defining multiple High-performance backends is deprecated and will no longer be supported in the upcoming version. Instead a load-balancer should be set up together with clustered signaling servers and configured in the Talk settings. For more details see the documentation 
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Curious what I need to do as an AIO user. I could not configure nextcloud bare metal option and have everything work so I went with the AIO. Will I have to setup a load balancer and signal server before my next update?