| tstarling added a comment. |
The drop may have been caused by the API maxlag parameter. Wikidata:Bots recommends using a maxlag parameter, and some client libraries set maxlag=5 by default. The point of this feature is to make bots pause during replication lag, to prioritise human users and avoid worsening the situation.
The relevant logs from this period have been deleted, so some guesswork is needed. I looked at the edits before the issue, between 3:50 and 4:00, and during the issue, between 4:20 and 4:30. In the earlier period, 7 out of the top 10 editors had "bot" in their names. Out of the remaining 3, 2 were using QuickStatements, a tool labs tool which edits at a high rate via OAuth. These 9 fully automated editors made 2727 edits in the earlier period, and 3 edits during the event.
The last of the top 10, Ghuron, made 240 edits in the earlier period and 48 during the event. The edits were repetitive, and similar in character across the two time periods.
If you exclude the top 10 editors from the earlier period from the analysis, the remaining edit rate only dropped from 194 to 115. The total number of unique users dropped from 53 to 38.
Maybe we should add some maxlag metrics to statsd.
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