/usr/share/doc/ruby-amqp/examples/tls_certificates/testca/index.txt 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 2 | V 120416201727Z 01 unknown /CN=giove.local/O=server
V 120416201833Z 02 unknown /CN=giove.local/O=client
|