Currently all variables that store proxy credentials have the prefix 'VersionCheck' assuming because this was the only part of phpmyadmin that uses these variables. However I also require those variables in my error reporting code and I did not want to use the same variable names since it is a misnomer at that point.
I renamed the variables and removed all the VersionCheck prefixes so they became ProxyUrl, ProxyUser and ProxyPass. I made the changes in the version_check.php code and in the docs.
I just wanted to inform you of this change since this may affect others once the error reporting system is merged with master