code: func (c *TopCommand) Initialize(app *kingpin.Application, config *service.Config) {
  	c.config = config
  	c.top = app.Command("top", "Report diagnostic information")
  	c.diagURL = c.top.Arg("diag-addr", "Diagnostic HTTP URL").Default("http://127.0.0.1:3434").String()
  	c.refreshPeriod = c.top.Arg("refresh", "Refresh period").Default("5s").Duration()
  }
docs: // Initialize allows TopCommand to plug itself into the CLI parser.