Over several stages we'll want to turn on the VirtualPageView schema to all wikis. We'll want to leave at least a day between each.
Currently it is only live on Hungarian Wikipedia, where we are seeing 4 events per second.
We estimated that recording a page interaction when a preview has been open for > 1000 ms will correspond to an increase in webrequests per pageview of 0.13%, which corresponds to ~700-800 events/sec (or, roughly, 2x the peak rate from the Page Previews instrumentation). AIUI the Hive EventLogging backend can handle this event rate 💪 but the processors need to be monitored to see if more need to be added.
= Roll out plan
[x] s6.dblist (fr, ja and ru wiki)
 wikipedia.dblist - top6-wikipedia.dblist (all but the top 6 wikipedias)
 All wikis
For each roll out:
 Ping @Ottomata and @Nuria on ticket to let him know its happening.
 Enable the wikis ($wgPopupsVirtualPageViews)
 Check [[ https://grafana.wikimedia.org/dashboard/db/kafka-by-topic-prometheus?refresh=5m&orgId=1&var-datasource=eqiad%20prometheus%2Fops&var-cluster=kafka_jumbo&var-kafka_broker=All&var-topic=eventlogging_VirtualPageView&from=1521219661685&to=1521230461685 | rate per second graph ]], ensuring we are below the estimated 700-800 events per second and report in ticket.