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The Multilogs allow for separate logs of multi-domains on a shared hosting from those in the primary domain, making it an ideal tool for resellers.
When you add a multi-domain on your hosting, you can choose to separate the logs of this multi-domain by checking the "Separate the logs of the primary domain".
You can then access the logs from this domain on a different page to that of your main domain.
You can also assign access to these logs. So if you host the sites of several people on shared hosting, you can provide each with direct access to their site's statistics.
The Multilog is a first step towards shared services that OVH want to put in place for resellers and clients managing several sites offering the same hosting. This is a free option.