/usr/share/pki/ca/emails/rnJob1.txt is in pki-ca 10.6.0-1ubuntu2.
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 | The following certificate is going to expire (or has expired) on
$NotAfter
Serial number = 0x$HexSerialNumber
SubjectDN = $SubjectDN
You can renew this certificate by clicking the "Renewal" button
at the following URL:
https://$HttpHost:$HttpPort
|