From IRC tonight:
02:03 < logmsgbot> !log LocalisationUpdate failed (1.26wmf14) at 2015-07-22 02:03:18+00:00 02:03 < logmsgbot> !log LocalisationUpdate failed (1.26wmf15) at 2015-07-22 02:03:19+00:00
Looking at the SAL, the last time that completed successfully was July 13th, iow, it coincides with the deploy of wmf14.