I would suggest that they do need to know. If the factory do no get feedback of issues through the warranty arrangements, then they won't investigate further & issues such as this that could be investigated if there is a pattern emerging won't be.
An odd problem could be just a random event. A persistant problem can be investigated further to see if it a bearing batch problem affecting a certain number of bikes, or a more serious design issue that requires re-engineering and maybe a recall. If they don't know there is a problem, nothing will happen.
IIRC you bike was not new when you bought it ? If that is the case, then there is nothing to say that the first owner or supplier didn't jet wash the bike - a known "killer" of wheel bearings.
IIRC there was an issue with early Himalayans with corroding steering head bearings, but that was shown to be an under greasing problem at the factory that was addressed - probably due to the number of warranty claims prompting an investigation.