logfile

raw details (from release v2.2.3):

{
  "name": "logfile",
  "properties": {
    "short": "o",
    "long": "log",
    "value_name": "FILE",
    "takes_value": "true",
    "help": "\n                    \"Redirect logging to the specified file, '-' for standard error. Sending the \\\n                     SIGUSR1 signal to the validator process will cause it to re-open the log file\",\n                "
  },
  "isDeprecated": false
}