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

# Overlay and enable change events

> Overlay and enable change events in Cortex XCOR to understand what changed in your environment.

When investigating issues, on-call engineers can enable and overlay *change events* on
[dashboards](/observe/enable-events/dashboards),
[traces](/observe/enable-events/traces), and
[services](/observe/enable-events/services). This additional context helps correlate
events with system and service anomalies in real-time, allowing for quicker
identification of incident cause.

[Change events](/overview/concepts/change-events) can also display in the
**Query Results** for individual monitors. When on-call engineers click links in
Palo Alto Networks Cortex XCOR notifications, they're directed to the **Monitors** page for
the related alert. On-call engineers can
[display change events for a monitor](/investigate/alerts/monitors/monitor-actions#filter-change-events)
using predefined filter configurations, or define queries using advanced filtering to
display the events they want to visualize. This capability helps to determine issues
before the alert triggered, such as code deploy and audit log events.

On-call engineers can also [create change events](/observe/enable-events/use-events)
from Cortex XCOR or with the Cortex XCOR API. This feature
lets on-call engineers create relevant change events, such as a broadcast to inform
other users of upcoming maintenance, or create third-party change events in addition
to the predefined change event categories.


## Related topics

- [Ingest, filter, and overlay change events](/overview/types/change-events.md)
- [Enable change events on traces](/observe/enable-events/traces.md)
- [Enable change events on service pages](/observe/enable-events/services.md)
- [Enable change events on dashboards](/observe/enable-events/dashboards.md)
- [Extend services](/observe/services/extending-services.md)


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