We got the following message in JST, 

• @miyoki@uchiyama@Nobuhiro KIMURA [vacuum-alert] GV is closed 2025-01-12 08:03:28.332043 GV_ITMY GV is closed
• @miyoki@uchiyama@Nobuhiro KIMURA [vacuum-notification] GV is opened 2025-01-12 08:03:32.829372

Only 4 seconds difference between these messages.

But, all GVs are open according to webcam images(Fig.1 and 2), except for the IYC-BS side(Fig.3. The high elevation stand is an obstacle!!), and the web-monitor page.

The GV closing setting values are listed in klog#32173.

Uchiyama-kun found a NULL or zero signal for GV_ITMY as in the attached file (Fig.4). Only the message about closing seemed to be sent, and no closing GV happened.

No remarkable enhancement of vacuum level in any places as Fig.5. (-1 hour and 10 minutes is the timing when the warning was sent via slack in this Fig.)