This file is indexed.

/etc/texmf/web2c/mktex.cnf is in tex-common 4.04.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# global font cache, also change VARTEXFONTS in 05TeXMF.cnf
#: ${MT_FEATURES=appendonlydir:varfonts}
# per user font cache 
: ${MT_FEATURES=appendonlydir:texmfvar}
#: ${MODE=ljfour}
#: ${BDPI=600}
# uncomment the following line to use ps2pk instead of gsftopk:
# : ${ps_to_pk=ps2pk}