Currently mozharness while adapting structured log, output format to stdout(which is showed on treeherder) will be modified by tpblOutputFormatter instead of original one ex: ReftestOutputFormatter. For reftest we added condition for replacing output formatter however we might need a generic solution such like mapping table for test suite and corresponding formatter.

Paul, did you have any additional ideas for this?

This bug was a followup to https://dxr.mozilla.org/mozilla-central/source/testing/mozharness/scripts/desktop_unittest.py#700 Because tpblOutputFormatter modify the original log, we need to import reftestOutputFormatter as workaround. If this is not a special case, I think we can - replace this block and prepare mapping table for test suite and its formatter or - patch tpblOutputFormatter to tackle with differences among test suites.