/usr/share/pki/ca/emails/publishCertsItem.html 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 9 10 11 | <TR>
<TD><B>0x$HexSerialNumber</B></TD>
<TD><B>$SubjectDN</B></TD>
<TD><B>$IssuerDN</B></TD>
<TD><B>$NotAfter</B></TD>
<TD><B>$Status</B></TD>
</TR>
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