DEV-878 Fixed missing curly bracket

templates/prometheusRules/s3_capacity_monitoring.yaml

@@ -14,7 +14,7 @@ spec:
           for: 10m
           labels:
             severity: warning
-          expr: avg(minio_cluster_capacity_usable_free_bytes{namespace="{{ .Release.Name }}") * 100 / avg(minio_cluster_capacity_usable_total_bytes{namespace="{{ .Release.Name }}"}) < 15 
+          expr: avg(minio_cluster_capacity_usable_free_bytes{namespace="{{ .Release.Name }}"}) * 100 / avg(minio_cluster_capacity_usable_total_bytes{namespace="{{ .Release.Name }}"}) < 15 
           annotations:
             message: there is less than 15% left. plz check for deletion or increase capacity
         - alert: s3_cluster_capacity_critical