How add custom message in alert

Hi All,

In my graylog Email alert generate with URL*

I want to appended extra parameter to select field be default, them we can direclty go to URL with all select fields, see the example below here i need to remove 'q=*'
and add fields like "Input_App_Name_01, Input_App_Size_01, Input_App_Name_02, Input_App_Size_02, " etc

any suggestion to do this ,

Modifying the URL in the stream_url variable is currently not possible.

See for a list of available variables.