Usage of /usr/bin/maketestdata:
      --alsologtostderr                   log to standard error as well as files
  -h, --help                              display usage and exit
      --log_backtrace_at traceLocations   when logging hits line file:N, emit a stack trace
      --log_dir string                    If non-empty, write log files in this directory
      --log_link string                   If non-empty, add symbolic links in this directory to the log files
      --logbuflevel int                   Buffer log messages logged at this level or lower (-1 means don't buffer; 0 means buffer INFO only; ...). Has limited applicability on non-prod platforms.
      --logtostderr                       log to standard error instead of files
      --stderrthreshold severityFlag      logs at or above this threshold go to stderr (default 2)
      --v Level                           log level for V logs
      --vmodule vModuleFlag               comma-separated list of pattern=N settings for file-filtered logging