---
title: Alerts and Notifications
---

# Alerts and Notifications

Alerts monitor for issue patterns over time and fire when conditions are met, while Notifications
trigger instantly when specific events occur, like a new issue group being detected or a specific
issue recurring. Both can be configured to connect to external channels, such as Slack or PagerDuty.

## Alerts

Alerts are associated with a specific [Saved View](filtering.md#saved-views). Each view can have as many alert
configurations as needed. Use Alerts to track patterns by frequency or trends in the number impacted
users, sessions, or events, or by specific thresholds for a duration:

- Frequency-based monitors fire when issues received exceed a defined threshold within a set time
  window.
- Trend-based monitors fire when the rate at which issues are received increases compared to a prior
  time period.

### Percent-Based Alerts

Some alert conditions permit activation based on the percentages of affected sessions or user
devices rather than absolute counts.

The percentage is calculated using the **gross total of sessions or user devices** observed in the
selected time window for the given app identifier. This calculation does _not_ account for
additional filters applied in the View. Percentages therefore reflect app-wide impact, and may
differ from filtered counts shown elsewhere.

=== "Alert Configuration"

    ![Configure Alert](../../assets/images/issues_create_alert@2x.webp "Configure Alert"){ srcset="../../assets/images/issues_create_alert.webp 1x, ../../assets/images/issues_create_alert@2x.webp 2x" }

=== "Alert List"

    ![Alert List](../../assets/images/issues_alerts_list@2x.webp "Issues Alerts List"){ srcset="../../assets/images/issues_alerts_list.webp 1x, ../../assets/images/issues_alerts_list@2x.webp 2x" }

=== "Alert Details"

    ![Alert Details](../../assets/images/issues_alert_details@2x.webp "Alert Details"){ srcset="../../assets/images/issues_alert_details.webp 1x, ../../assets/images/issues_alert_details@2x.webp 2x" }

## Notifications

Notifications are associated with a specific [Saved View](filtering.md#saved-views). Each View can have at most
one of each notification type. Use Notifications provide immediate visibility to detected issues:

- "New Error" configurations fire when a previously unseen issue is detected, creating a new group.
- "Every Error" configurations fire for each occurrence of an issue, to assist in investigating rare
  but severe issues.