Maintainers for libblkid1 are util-linux packagers <util-linux@packages.debian.org>.
You may want to refer to the following packages that are part of the same source: bsdextrautils, bsdutils, eject, fdisk, libblkid-dev, libfdisk-dev, libfdisk1, libmount-dev, libmount1, libsmartcols-dev, libsmartcols1, libuuid1, mount, rfkill, util-linux, util-linux-extra, util-linux-locales, uuid-dev, uuid-runtime.
You might like to refer to the libblkid1 package page, to the Package Tracking System, or to the source package src:util-linux's bug page.
If you find a bug not listed here, please report it.