Comment 1 for bug 1687129

This is the format we have now (in the staging esm service, soon to be deployed to production)

500 https://extended.security.staging.ubuntu.com/ubuntu/ precise/main i386 Packages
     release v=12.04,o=UbuntuESM,a=precise,n=precise,l=UbuntuESM,c=main
     origin extended.security.staging.ubuntu.com

Here is a "normal" precise repo, for comparison:
 500 http://br.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
     release v=12.04,o=Ubuntu,a=precise,n=precise,l=Ubuntu,c=main
     origin br.archive.ubuntu.com