Old linux-image packages in precise-updates

[mian]

Hi team,

     I'm from CTS team and some our customers are wondering with the 
strategy/policies of packages in repositories, first of all, I totally 
believe that the current  strategy should be the best practice for us to 
achieve the most efficient and effective administration/maintenance for 
customers, I'm just hoping that anyone here can help give some more 
advices/reasons about why we choose the current strategy to upstream and 
maintain the repository, or any more efficient usage of apt-mirror, then 
I can give the customer a more comprehensive and precise explanation.

     The question is:

     Is it expected that all superseded linux-image packages are still 
listed as current in precise-update repositories (e.g. Packages file)?
     This affects main (linux-image), debian-installer (udeb), and 
universe (linux-lowlatency).
     This adds a lot of unnecessary bloat when running an apt-mirror.

     All other packages (e.g. glibc) seem to have older superseded 
releases culled from the latest Packages files.

     bash-3.2$ curl -O 
http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/main/binary-amd64/Packages.bz2 

     bash-3.2$ bzgrep linux Packages.bz2 | grep Filename | grep 
linux-image | wc -l
      228

     bash-3.2$ curl -O 
http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/binary-amd64/Packages.bz2 

     bash-3.2$ bzgrep linux-lowlatency Packages.bz2 | grep Filename | 
grep linux-image | wc -l
      35

     bash-3.2$  curl -O 
http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/main/debian-installer/binary-amd64/Packages.bz2 

     bash-3.2$ bzgrep linux Packages.bz2 | grep Filename | grep 
kernel-image | wc -l
      171

     Any comments/advices are much appreciated.

Thanks
MianHou

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