To allow the customer to omit certain files from the final must-gather, we give the option to supply a globbing pattern like that: 

   # this omits all crt files
   - type: file
     pattern: "*.crt"

That should omit all files ending in ".crt". We should allow customers to also run against the whole relative path (from the must-gather root) and use globbing like this:

pattern: "release-4.10/ingress_controllers/*/haproxy.*"

Which match all different ingress controllers and all below files prefixed by haproxy.
 
AC: 

• well tested and working logic to supply regex and globs to filter out files