Tileid= 21984 marked as unsure

[araichoor]

Tileid=21984 has been observed with expids=134791-92 on 20220514.
It has several r- and z-band sky alerts (petals 4-5-6-7-8-9); and a suspicious bgs_faint n(z), despite having nominally ~1.5 more effime than required (efftime=265s):
https://data.desi.lbl.gov/desi/spectro/redux/daily/tiles/cumulative/21984/20220514/tile-qa-21984-thru20220514.png

If relevant, on the same night, all backup exposures from expid=134789 onwards were flagged as "unsure" by the observers in the nightlog.
Besides, these expids=134791-92 were preceded/succeded with backup observations, so conditions might have been variable.

[schlafly]

This is a large sky residual case that has been added to the list of tiles for reprocessing in
#4
Closing here.