Here is the updated, fully revamped DX Infrastructure Availability-HA Guide for UIM 23.4 CU3. The guide covers the following areas of implementing high availability in UIM:
Secondary (HA) hub Installation/Upgrade
Secondary Admin console setup
Message queue setup
Message queue pairing and naming
Queue and probe enabling/disabling
Hub installation
HA hub troubleshooting
Probe configuration
Key Nas options such as forwarding and replication
Testing of failover and failback
HA Limitations
HA Troubleshooting
spectrumgtw failover tips
How to troubleshoot hub activity pre-failover, during failover and post-failover
General Best Practices for HA
Environment
DX UIM Infrastructure Observability (UIM) 23.4.x or higher