> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chronosphere.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Alert notifications

When a monitor generates an alert in Chronosphere Observability Platform, it triggers
*notifiers* based on the assigned *notification policy*.

[Notifiers](/investigate/alerts/notifications/notifiers) are the endpoints receiving
notifications, including where to deliver alerts and who to notify. You can configure
notifiers to send details of the alert to a channel such as email, PagerDuty, or
Slack.

Observability Platform also supports unfurling of monitor graphs in
[Slack](/investigate/alerts/notifications/slack). This integration enables Slack
users to view or share monitors in Slack channels aimed at mitigating alerts.

[Notification policies](/investigate/alerts/notifications/policies) are rules that determine how
to route notifications to notifiers based on signals that trigger from monitors.
Teams own notification policies, and assign them either to a specific monitor or set
as a default policy for all monitors in a specified collection.

For programmatic configuration, the [Chronosphere API](/tooling/api-info) can
route alerts with inline `destinations` that reference
[external connections](/investigate/alerts/notifications/external-connections),
the default approach for new credentials and routes. The same API still accepts
`notifier_slugs` that reference separate
[notifiers](/investigate/alerts/notifications/notifiers) until you finish moving
those routes. You can't set both on the same notifier list. While you
migrate, see
[Notifier resource migration](/investigate/alerts/notifications/external-connections#notifier-resource-migration).

Optionally, you can use [signals](/investigate/alerts/notifications/signals) to create groups of
notifications. Signals determine how to group alerts, which affects how many
notifications Observability Platform sends.

To customize the title and description of notifications generated by a monitor,
see [Notification templates](/investigate/alerts/monitors/notification-templates).

To view a history of alerts for a monitor:

1. In the navigation menu, select
   **<Icon icon="bell" /> Alerting <span aria-label="and then">></span> Monitors**.
2. Select a monitor.
3. Click [Alert history](/investigate/alerts/monitors/monitor-details#alert-history)
   in the actions menu.