About the false alarm at 8:03:28 reported in klog#32316
> @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
A NULL or zero signal for GV_ITMY found by Uchiyama-san have rarely been seen on StripTool before. But we had thought it's a reading error on the StripTool itself. In this time, we was able to confirm that this issue was occurred on two independent clients (k1mon10 and k1grd0) by newly implementing the Guardian alert about GVs. So I wonder this issue is not a reading error on the clients but some kind of a sending error on MOXA/Saba-taro which is the interface of CC-10 for making EPICS records.

A important thing is that an interval of two alerts ("GV is closed" and "GV is opened") is ~4 seconds. It means a NULL or zero signal was provided in continuous 4 seconds (We need DAQ for these channels for more careful and detailed checks). If an interval of two alerts is only 1 or 2 samples (1/16s or 2/16s), Guardian can take care about this issue easily by changing the trigger condition as closed flag is enabled in continuous two samples. But a wrong signal in 4 seconds is too long for Guardian and also for the safety checks. So I think that this issue should be removed or at least mitigated on MOXA/Saba-taro side.

About the actual alert at 13:12:16 reported in klog#32319
> 2025-01-12 13:12:16.893314 GV_BSY GV is closed GV_BSX GV is closed.
> 13:12@miyoki@uchiyama@Nobuhiro KIMURA [vacuum-alert] out of the nominal range 2025-01-12 13:12:32.844101
> KGRVAC_CCG_BSY_01_VAL_PRESS: current=8e-06, threthold=8e-06
An alert about closing GVs were sent before an alert about increasing a pressure value.

The threshold for the alert about increasing a pressure value was set as 8.0e-6Pa in klog#32116. This value was decided based on the past threshold for closing GVs as 9.4e-6Pa in klog#32173. Unfortunately, the threshold for closing GVs was changed to 7.5e-6Pa which was lower than one for increasing a pressure value (klog#32306) and it's not shared before entering weekend. So the guardian alert for increasing a pressure value no longer worked. For this reason, there is no guardian log before closing GVs and I cannot do a same thing as klog#32290.