diff --git a/_data/rules.yml b/_data/rules.yml
index 02c5794..2fba048 100644
--- a/_data/rules.yml
+++ b/_data/rules.yml
@@ -2243,6 +2243,12 @@ groups:
                 query: 'vault_token_count_by_ttl{creation_ttl="+Inf"} > 3'
                 severity: warning
                 for: 5m
+              - name: Vault cluster health
+                description: 'Vault cluster is not healthy {{ $labels.instance }}: {{ $value | printf "%.2f"}}%'
+                query: 'sum(vault_core_active) / count(vault_core_active) > 0.5'
+                severity: warning
+                for: 5m
+                  
 
       - name: Cloudflare
         exporters: