On May 16th we lower the sampling rate of media viewer events as the event rate was ~170 events per second. It looks like as of  a week and a half ago we are again at that rate. 

Please see:

https://ganglia.wikimedia.org/latest/graph.php?r=month&z=xlarge&c=Miscellaneous+eqiad&h=vanadium.eqiad.wmnet&jr=&js=&v=645622124&m=eventlogging_all-events&vl=events&ti=all-events

This means that Media Viewer is generating about 15 million rows a day on EL database, a data flow that seems quite high for our capacity to analyze it. 

Is this a mistake? Should sampling rates be lowered again? 

So you know, right now media viewer is sampling more than twice as much the rest of the teams at the foundation together. If every team sampled at this ratio the system will go down. Now, at this time,  event logging is not at risk of going down but the replication is affected.

Thanks,

Nuria