- Time Filter:- It is the duration to which you want the alert history to be generated. There are various options, such as - Last 10 minutes,Last 30 minutes, last 1 hour, last 2 hour, last 4 hour, last 6 hour,last 12 hour, last 24 hour, today, yesterday, last 7 days, this week, last 3 weeks, last 6 months, last year, custom. In case of custom, provide the start date and time and end date and time.