Existing Echo charts are *weird*: http://ee-dashboard.wmflabs.org/dashboards/enwiki-features
- some are missing data in October (e.g. enwiki_echo_clicks_by_category)
- recent data seems contradictory (e.g. echo_views_by_category shows a view decrease, but echo_views_by_source shows an increase)
- recent data unexpectedly seems very different compared to before (e.g. a lot fewer "talk" clicks in echo_clicks_by_category since November)
Perhaps there are good reasons the data is suddenly very different. Perhaps the queries are wrong. Figure out what's happening!