code: func (c *Client) LogDrainDelete(appIdentity string, logDrainIdentity string) error {
  	return c.Delete("/apps/" + appIdentity + "/log-drains/" + logDrainIdentity)
  }
docs: // Delete an existing log drain. Log drains added by add-ons can only be removed
  // by removing the add-on.
  //
  // appIdentity is the unique identifier of the LogDrain's App. logDrainIdentity
  // is the unique identifier of the LogDrain.