diff --git a/selfprivacy_api/utils/monitoring.py b/selfprivacy_api/utils/monitoring.py
index 4771bfb..762e35a 100644
--- a/selfprivacy_api/utils/monitoring.py
+++ b/selfprivacy_api/utils/monitoring.py
@@ -70,7 +70,7 @@ class MonitoringQueries:
             )
             if response.status_code != 200:
                 return MonitoringQueryError(
-                    error="Prometheus returned unexpected HTTP status code"
+                    error=f"Prometheus returned unexpected HTTP status code. Error: {response.text}"
                 )
             json = response.json()
             if result_type and json["data"]["resultType"] != result_type:
@@ -96,7 +96,7 @@ class MonitoringQueries:
             )
             if response.status_code != 200:
                 return MonitoringQueryError(
-                    error="Prometheus returned unexpected HTTP status code"
+                    error=f"Prometheus returned unexpected HTTP status code. Error: {response.text}"
                 )
             json = response.json()
             if result_type and json["data"]["resultType"] != result_type:
diff --git a/tests/data/turned_on.json b/tests/data/turned_on.json
index 9c285b1..a5241ec 100644
--- a/tests/data/turned_on.json
+++ b/tests/data/turned_on.json
@@ -65,6 +65,10 @@
         },
         "roundcube": {
             "enable": true
+        },
+        "prometheus": {
+            "enable": true,
+            "location": "sdb"
         }
     },
     "volumes": [