/usr/share/doc/ruby-amqp/examples/tls_certificates/testca/private/cakey.pem 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 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | -----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
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