In reference to the issue posted here the component SSL Certificate Expiration Monitor retrieves the information including the certificate issuer, however the issuer is not stored to the database so it cannot be retrieved.
In the referenced post aLTeReGo suggests that the information be copied and pasted into the component notes. This is a manual process that would have to be performed for each server monitored unless all certificates are issued from the same CA.
Since this information is critical to resolving the issue of certificate expiration, I would say the component should be modified to capture this information to the database automatically rather than make it a manual process.