alerted
a-lert-ed
verb
Warned someone about a danger, problem, or important situation.
"The system alerted staff to the fire."
Thesaurus
Synonyms: alert, alerting, alarm, warning signal, alarum, argus-eyed, sleepless, lidless, wakeful, wide-awake, fly, vigilant
Antonyms: unalert, unvigilant, unwatchful