Forty-seven percent of respondents reported personally investigating 10 to 20 alerts each day, a 12% increase from 2019. 25% of respondents said they investigate 21 to 40 alerts per day, up from 14% the year prior. Nearly 70% said that 25 to 75% of the alerts they investigate on a daily basis are false positives. Almost half of respondents (49%) said they turn off high volume alerting features when there are too many alerts for analysts to process, creating the potential for a legitimate and serious alert to be missed.
Source: https://www.helpnetsecurity.com/2021/03/11/alert-overload-still-plagues-cybersecurity-industry/