Bumping this thread to make sure people saw it.  If you own an Event Logging Schema and you're not aware that automatic purging of old events is about to start, check out what Marcel has to say.

On Wed, Jul 27, 2016 at 2:48 PM, Marcel Ruiz Forns <mforns@wikimedia.org> wrote:
Hi EventLogging schema owners,
(cc-ing Analytics-l)

EventLogging's new auto-purging mechanism is about to be productionized[1]. This implies that from now on:
  • EventLogging data will be purged according to the specific purging strategy of each schema. Those strategies were agreed with you all either in last year's audit (older schemas), or this year's re-audit (schemas created since then), and can be found in the schema talk pages.

  • The default purging strategy for new schemas will be: full auto-purge after 90 days. If you want to keep your data for more than that, please contact the Analytics team and we'll analyze your schema and discuss a purging strategy that fits your needs.

  • If you modify an existing schema, fields that were kept indefinitely in the previous revision will continue to be kept. However, if you add new fields to the schema, those will be auto-purged after 90 days by default. If you want to keep them for more than that, please contact the Analytics team, we'll discuss that and mark them to be kept.

Please, feel free to ask any questions about this process.

[1] https://phabricator.wikimedia.org/T108850

Marcel Ruiz Forns
Analytics Developer
Wikimedia Foundation