Update: Grafana OnCall OSS

Author: vstpme

README.md

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+# 🚨 Update: Grafana OnCall OSS 🚨
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+As of 2025-03-11, Grafana OnCall (OSS) has entered maintenance mode and will be archived on 2026-03-24. While you may continue to use OnCall OSS in its current state, no further updates or new features will be introduced. However, we will still provide fixes for critical bugs and for valid CVEs with a CVSS score of 7.0 or higher.
+
+For users seeking a fully supported and actively maintained alternative, **Grafana Cloud IRM** offers a modern approach to incident response and on-call management.
+
+- [Grafana OnCall OSS updates blog](https://grafana.com/blog/2025/03/11/grafana-oncall-maintenance-mode/)
+- [Grafana Cloud IRM announcement blog post](https://grafana.com/blog/2025/03/11/oncall-management-incident-response-grafana-cloud-irm/)
+- [Migration Guide](https://grafana.com/docs/oncall/latest/set-up/migration-from-other-tools/)
+
 # Grafana OnCall
 
 <img width="400px" src="docs/img/logo.png">