Alert should have been triggered by an issue, but it did not

### Environment SaaS (https://sentry.io/) ### Steps to Reproduce 1. Set up an alert that should trigger when the number of events in an issue is more than 3 in 15m 2. An issue met this condition, but when the events came in so close together the query didn't catch them all and the alert didn't trigger Please find an example and additional information in the Jira shadow ticket. ### Expected Result The alert should trigger in every case when the condition is met ### Actual Result The alert did not trigger ### Product Area Alerts ### Link _No response_ ### DSN _No response_ ### Version _No response_ ┆Issue is synchronized with this [Jira Improvement](https://getsentry.atlassian.net/browse/FEEDBACK-2380) by [Unito](https://www.unito.io)