There is currently no main/default maintainer, all parts of the codebase have named maintainers:
remote_write
: Tom Wilkie (tom.wilkie@gmail.com / @tomwilkie)openmetrics
: Richard "RichiH" Hartmann (richih@richih.org / @richih)promql
: Julius Volz (julius.volz@gmail.com / @juliusv)