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With this module site admins are able to control load balancers using health
check "pages" (callbacks). Each callback registers all host names that has been
used to call that single callback. Once hosts are registered to a database
administrator can set each host status either "up" or "down" from Drupal
administrator interface.
This is simple dropdown menu and it works for main menu. after enable this module, a block will be generate and you can enable in according to your region.