select left(timestamp,8), count(*) from UploadWizardErrorFlowEvent_11772725 where event_code='missingparam' and event_step='file' group by left(timestamp,8);
+-------------------+----------+ | left(timestamp,8) | count(*) | +-------------------+----------+ | 20150608 | 1 | | 20160302 | 11 | | 20160303 | 168 | | 20160304 | 71 | | 20160305 | 65 | | 20160306 | 78 | | 20160307 | 81 | | 20160308 | 83 | | 20160309 | 69 | | 20160310 | 59 | | 20160311 | 40 | | 20160312 | 42 | | 20160313 | 69 | | 20160314 | 21 | | 20160315 | 87 | | 20160316 | 94 | | 20160317 | 52 | | 20160318 | 69 | | 20160319 | 24 | | 20160320 | 40 | | 20160321 | 11 | +-------------------+----------+ 21 rows in set (0.63 sec)
This sudden onset of 'missingparam' on 'file' step (they also occur for 'details', but I suspect that's all T130549) is new and matches 1.27.0-wmf.17 deployment to Commons (2016-03-02). We did a lot of refactoring in that version :(