hello fleet team. is there any upgrade path you would recommend for someone who is running a very old version of kolid fleet osquery ? And any specific upgrade instructions for folks coming over from older versions of kolide fleet ?

Assuming you're on 3.x? I would advise upgrading to 3.13.0 first, making sure things are good, and then up to 4.13.2. Definitely back up your database before doing any of the migrations.