There were alerts triggered during weekly schedule after DST changes in EST time zone .The weekly schedule had been created before the DST change
UIM 23.4 CU4
Engineering will be adding additional logging and fix will be part of the upcoming UIM CU releases (tentative 23.4 CU8)
To avoid this issue,recommendations for recurring schedules to avoid any DST issues
Create the schedule in UIM Server timezone(example EST) instead of choosing other timezone(in this case Asia/Calcultta was chosen in OC schedule).