/usr/share/doc/ruby-amqp/examples/tls_certificates/server/key.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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