Skip to main content

Why are my Alerts not Triggering

Why a Sentry alert didn't fire or send a notification, and which alert, integration, and notification settings to check.

Issue

An event shows up in Sentry, but the expected Alert didn't send a notification to the configured destination (Slack, email, etc.).

Applies To

  • Alerts

  • Monitors

  • Notifications

Symptoms

  • No notification was sent, even though the Alert fired for the same issue before.

  • The Alert fired when the issue was first created but not when new events arrived later.

Resolution

Open the Alert under Monitors → Alerts and work through these checks:

  1. Alert history: On the details page, check whether the Alert ran for this issue. If it ran, skip ahead to the action and recipient checks.

  2. Status: Make sure the Alert is turned on.

  3. Source: Make sure the issue's project is included. If the Alert uses Alert on specific monitors, make sure the connected Monitors are the ones that create this issue.

  4. Environment: Make sure the Alert's environment matches the event's environment tag.

  5. Triggers (When): A new issue is created fires only once per issue. To be notified about later activity, add An event or issue activity is captured, An issue escalates, or A resolved issue regresses. Manually unresolving an issue doesn't count as a regression.

    • Filters (If):

      • Make sure the event matches the block's filters under its all, any, or none qualifier.

      • Watch for filters that stop matching as the issue changes: Issue age, Issue priority, and Issue assignment.

      • Look for warning icons. Frequency and event attribute filters only work with A new issue is created and An event or issue activity is captured.

    • Actions (Then):

      • Make sure the block has a valid action.

      • For Notify on preferred channel, make sure the recipient exists. Suggested Assignees require an assignee, ownership rules, or suspect commits.

      • For Slack, Teams, PagerDuty, and similar integrations, make sure the integration is installed under Settings → Integrations and the destination is still valid.

      • Use Send Test Notification to confirm delivery.

  6. Throttling: Make sure the throttle window isn't suppressing repeat notifications for the issue.

  7. Personal notification settings: Under Settings → Notifications → Alerts, make sure alerts are on, the delivery method (email, Slack) is selected, no project-level override turns them off, and Email Routing points to the right address.

For details on every Alert option, please consult Creating an Alert.

Related Articles
Did this answer your question?