Update CHANGELOG.md

Author: github-bot-dnation

CHANGELOG.md

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 # Changelog
 
+## [v2.7.8](https://github.com/dNationCloud/kubernetes-monitoring/tree/v2.7.8) (2025-12-04)
+
+[Full Changelog](https://github.com/dNationCloud/kubernetes-monitoring/compare/v2.7.7...v2.7.8)
+
+**Merged pull requests:**
+
+- Add Ceph app window in cluster overview [\#217](https://github.com/dNationCloud/kubernetes-monitoring/pull/217)
+
 ## [v2.7.7](https://github.com/dNationCloud/kubernetes-monitoring/tree/v2.7.7) (2025-11-26)
 
 [Full Changelog](https://github.com/dNationCloud/kubernetes-monitoring/compare/v2.7.6...v2.7.7)
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