/usr/share/doc/ruby-amqp/examples/tls_certificates/client/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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