Line glitch appeared on DARM at 2023-04-21 13:12:00.
https://gwdet.icrr.u-tokyo.ac.jp/~controls/hveto/day/20230421/scans/1366117938.001953/

This line like glitch around 100 Hz also appeared to ASC-OMC_REFL_QPDA1_DC_PIT at the same time.
Fluctuations in the IR beam may be related to this glitch.
There is also a line glitch around 30 Hz.
Green QPDs at Yarm have this 30 Hz glitch at the same time.