Hubzilla Documentation:



Called when generating the Link HTTP header for the channel page. Different protocol stacks can add links to this header.

Hook data = array
    'channel_address' => channel nickname, no checking is done to see if it is valid
    'channel_links' => array of channel links in the format
        'url'  => url of resource
        'rel'  => link relation
        'type' => MIME type

All fields are required