This file is indexed.

/usr/lib/systemd/user/gpg-agent.socket is in gpg-agent 2.2.4-1ubuntu1.2.

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

The actual contents of the file can be viewed below.

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[Unit]
Description=GnuPG cryptographic agent and passphrase cache
Documentation=man:gpg-agent(1)

[Socket]
ListenStream=%t/gnupg/S.gpg-agent
FileDescriptorName=std
SocketMode=0600
DirectoryMode=0700

[Install]
WantedBy=sockets.target