LHO is seeing DARM/ ETMX L3 "glitches" ~500ms before lockloss
e.g. https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=73818
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=73565
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78479
Would want a new plug in to check for this.
Might tricky to code something that would pick up glitches but not continuous motion from an EQ. Maybe a similar standard deviation check as in refine.py