code: func (c *Subcommand) DefaultMeta() lucicfg.Meta {
  	if c.params == nil {
  		panic("call Init first")
  	}
  	return lucicfg.Meta{
  		ConfigServiceHost: c.params.ConfigServiceHost,
  		ConfigDir:         "generated",
  	}
  }
docs: // DefaultMeta returns Meta values to use by default if not overridden via flags
  // or via lucicfg.config(...).