text: Title: kubectl --v= is underdocumented
  Body: _(Comes from user)_
  
  The most important thing for cloud support is insight, logs, verbosity. The description of the `--v` argument reads:
  `--v=0: log level for V logs`
  - What are the different log levels?
  - What level is most useful to see all API calls?
  - What is "V"?
  - What would be a useful standard reply to a customer? "Please re-run this command with --v=9 and send me the output"
  
  With gcloud I normally ask for the output of `--log-http --verbosity=debug`.
  
  @kubernetes/kubectl @ymqytw @pwittrock 
  