docs: basic etcdDatabaseHighFragmentationRatio response
diff --git a/docs/alerts.md b/docs/alerts.md
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+# Alerts
+
+## `etcdDatabaseHighFragmentationRatio`
+
+```console
+kubectl -n kube-system exec svc/kube-prometheus-stack-kube-etcd -- \
+ etcdctl defrag \
+ --cluster \
+ --cacert /etc/kubernetes/pki/etcd/ca.crt \
+ --key /etc/kubernetes/pki/etcd/server.key \
+ --cert /etc/kubernetes/pki/etcd/server.crt
+```