/lib/udev/rules.d/96-dell-recovery-partition.rules is in dell-recovery 1.48.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | ACTION!="add|change", GOTO="dell_rp_end"
SUBSYSTEM!="block", GOTO="dell_rp_end"
#Factory shipped Dell linux boxes will always have
#the second partition as a vfat with label "OS" or "install"
#shouldn't clash with windows factory shipped systems
#which may have "OS" as the third partition
ENV{ID_FS_TYPE}=="vfat", ENV{ID_FS_LABEL}=="OS|install", ENV{ID_PART_ENTRY_NUMBER}=="2", ENV{UDISKS_IGNORE}="1", ENV{ID_PART_ENTRY_SCHEME}=="gpt"
LABEL="dell_rp_end"
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