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In 3.6 P2 supports gathering of download statistics through a special property that can be set in meta-data: http://wiki.eclipse.org/Equinox_p2_download_stats . Unfortunately there is no tooling support to do this, yet, but it should be possible to manually tweak the meta-data if this is something of interest to the project.
This is important so that we have a sense of usage proportions for people who update. Would be nice to have done for Helios, but not critical.
Download stats are now recorded for all feature jar downloads for version 3.4.0 and later. The stats URL is http://download.eclipse.org/mylyn/stats/${version}/${artifactId}. A sample Apache log entry looks like this: pre. w.x.y.z - - [18/Mar/2011:06:20:07 -0400] "HEAD /stats/3.5.0/org.eclipse.mylyn_feature HTTP/1.1" 404 - "-" "Jakarta Commons-HttpClient/3.1" Statistic reports are accessible through the portal: https://dev.eclipse.org/committers/committertools/stats.php .
After speaking with Denis I updated the statistics URL pattern to this: http://download.eclipse.org/stats/mylyn/%version%/%artifactId% . Apparently the portal only records head requests under /stats.