If you have multiple Connection Server instances fronted by a load balancer, remove Connection Server instances from the load balanced cluster one at a time while you upgrade them. Make backups of connection server (If you have multiple Connection Server instances in a replicated group, make backups and record configuration settings for only one instance in the group.). There are a couple of prerequisites you need to have completed before starting the upgrade. Hence the below steps listed are from my experiences from the field in driving such upgrades within customer VDI environments. Hence missing out on any of the overall approach of prerequisites and readiness, can lead to upgrade roadblocks and production impact. 
Upgrading a Horizon Connection Server, will look straight forward as per the documentation, however the most important part is not just following the pre-requisites and compatibility, but also the environment readiness, which includes factors like roll back plan, post upgrade tasks like cleanups.
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