Generic flags:

      --allocate-node-cidrs                                                                           
                Should CIDRs for Pods be allocated and set on the cloud provider.
     ....
      --cloud-provider-gce-lb-src-cidrs cidrs                                                         
                CIDRs opened in GCE firewall for LB traffic proxy & health checks (default
                130.211.0.0/22,209.85.152.0/22,209.85.204.0/22,35.191.0.0/16)
      --cluster-cidr string                                                                           
                CIDR Range for Pods in cluster. Requires --allocate-node-cidrs to be true
     .....

Global flags:

      --alsologtostderr                                                                               
                log to standard error as well as files
  -h, --help                                                                                          
                help for kube-controller-manager
      --log-backtrace-at traceLocation                                                                
                when logging hits line file:N, emit a stack trace (default :0)
      --log-dir string                                                                                
                If non-empty, write log files in this directory
      --log-file string                                                                               
                If non-empty, use this log file
      --log-flush-frequency duration                                                                  
                Maximum number of seconds between log flushes (default 5s)
      --logtostderr                                                                                   
                log to standard error instead of files (default true)
      --skip-headers                                                                                  
                If true, avoid header prefixes in the log messages
      --stderrthreshold severity                                                                      
                logs at or above this threshold go to stderr (default 2)
  -v, --v Level                                                                                       
                log level for V logs
      --version version[=true]                                                                        
                Print version information and quit
      --vmodule moduleSpec                                                                            
                comma-separated list of pattern=N settings for file-filtered loggin

Fix missing flags in *-controller-manager --help.