The GetVCenterHostnames() method in pkg/util/cluster_info.go lacks proper synchronization and returns the internal slice reference directly. It may impact: 
  - Potential data race when SetVCenterVersion() modifies vcenterHostnames concurrently (called in CollectClusterInfo via goroutines)
  - External callers can modify the returned slice, affecting internal state

4.21, 4.22 and earlier