/etc/apache2/mods-available/zgridsite.load is in gridsite 3.0.0~20180202git2fdbc6f-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Depends: ssl
LoadModule gridsite_module /usr/lib/apache2/modules/mod_gridsite.so
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