GHAzDO: Add stale pipeline alert cleanup to Sprint 271 release notes

Author: laurajjiang

release-notes/2026/includes/ghazdo/sprint-271-update-links.md

@@ -8,3 +8,4 @@ ms.topic: include
 - [Advanced Security status checks for pull requests](#advanced-security-status-checks-for-pull-requests)
 - [Export results from security overview](#export-results-from-security-overview)
 - [Audit log events for Advanced Security enablement changes](#audit-log-events-for-advanced-security-enablement-changes)
+- [Automatic cleanup of alerts from stale pipeline configurations](#automatic-cleanup-of-alerts-from-stale-pipeline-configurations)

release-notes/2026/includes/ghazdo/sprint-271-update.md

@@ -42,3 +42,9 @@ Audit log entries include the actor, timestamp, and the specific settings that w
 - Secret push protection
 
 These events provide visibility into when and by whom security features are configured across your organization, supporting compliance and governance requirements.
+
+### Automatic cleanup of alerts from stale pipeline configurations
+
+Advanced Security now automatically hides alerts associated with pipeline configurations that have not been run in over 90 days. Alert fingerprints in Advanced Security are tied to specific pipeline configurations, so when a pipeline job or stage is changed, previously associated alerts can become orphaned if they were also resolved as part of the pipeline update.
+
+With this change, alerts linked to stale pipeline configurations are automatically hidden, reducing noise and ensuring that your alert results reflect your current CI/CD setup. You can also use the delete analysis API to manually hide alerts associated with specific pipeline configurations that are no longer in use.