/usr/share/doc/ruby-amqp/examples/tls_certificates/testca/index.txt.old is in ruby-amqp 0.9.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | V 120416201727Z 01 unknown /CN=giove.local/O=server
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