Warning about un-replicated data in DR failover

files/gitlab-ctl-commands-ee/lib/geo/promote_to_primary.rb

@@ -36,6 +36,7 @@ module Geo
       puts 'WARNING: Make sure your primary is down and also be aware that'.color(:yellow)
       puts 'this command only works for setups with one secondary.'.color(:yellow)
       puts 'If you have more of them please see https://docs.gitlab.com/ee/gitlab-geo/disaster-recovery.md#promoting-secondary-geo-replica-in-multi-secondary-configurations'.color(:yellow)
+      puts 'There may be data saved to the primary that was not been replicated to the secondary before the primary went offline. This data should be treated as lost if you proceed.'.color(:yellow)
       puts '---------------------------------------'.color(:yellow)
       puts