diff --git a/configs/config.json b/configs/config.json
index 6211fa0..49f1328 100644
--- a/configs/config.json
+++ b/configs/config.json
@@ -1,10 +1,38 @@
 {
   "main": {
-    "addr": "0.0.0.0:443",
-    "https-cert-file": "/etc/letsencrypt/live/url/fullchain.pem",
-    "https-key-file": "/etc/letsencrypt/live/url/privkey.pem",
+    "addr": "0.0.0.0:8082",
+    "https-cert-file": "",
+    "https-key-file": "",
     "jwt-public-key": "kzfYrYy+TzpanWZHJ5qSdMj5uKUWgq74BWhQG6copP0="
   },
+  "nats": {
+    "address": "nats://0.0.0.0:4222",
+    "username": "root",
+    "password": "root"
+  },
+  "metric-store": {
+    "checkpoints": {
+      "interval": "12h",
+      "directory": "./var/checkpoints"
+    },
+    "memory-cap": 100,
+    "retention-in-memory": "48h",
+    "cleanup": {
+      "mode": "archive",
+      "interval": "48h",
+      "directory": "./var/archive"
+    },
+    "nats-subscriptions": [
+      {
+        "subscribe-to": "hpc-nats",
+        "cluster-tag": "fritz"
+      },
+      {
+        "subscribe-to": "hpc-nats",
+        "cluster-tag": "alex"
+      }
+    ]
+  },
   "metrics": {
     "debug_metric": {
       "frequency": 60,
@@ -170,34 +198,5 @@
       "frequency": 60,
       "aggregation": "avg"
     }
-  },
-  "nats": {
-    "address": "nats://0.0.0.0:4222",
-    "username": "root",
-    "password": "root"
-  },
-  "metric-store": {
-    "checkpoints": {
-      "interval": "12h",
-      "directory": "./var/checkpoints"
-    },
-    "memory-cap": 100,
-    "retention-in-memory": "48h",
-    "cleanup": {
-      "mode": "archive",
-      "interval": "48h",
-      "directory": "./var/archive"
-    },
-    "nats-subscriptions": [
-      {
-        "subscribe-to": "hpc-nats",
-        "cluster-tag": "fritz"
-      },
-      {
-        "subscribe-to": "hpc-nats",
-        "cluster-tag": "alex"
-      }
-    ]
   }
-}
-
+}
\ No newline at end of file
diff --git a/internal/api/metricstore.go b/internal/api/metricstore.go
index 2239f12..e043079 100644
--- a/internal/api/metricstore.go
+++ b/internal/api/metricstore.go
@@ -416,21 +416,31 @@ func debugMetrics(rw http.ResponseWriter, r *http.Request) {
 // @security    ApiKeyAuth
 // @router      /healthcheck/ [get]
 func metricsHealth(rw http.ResponseWriter, r *http.Request) {
-	rawCluster := r.URL.Query().Get("cluster")
-	rawNode := r.URL.Query().Get("node")
+	req := metricstore.HealthCheckReq{}
 
-	if rawCluster == "" || rawNode == "" {
-		handleError(errors.New("'cluster' and 'node' are required query parameter"), http.StatusBadRequest, rw)
+	dec := json.NewDecoder(r.Body)
+	dec.DisallowUnknownFields()
+
+	if err := dec.Decode(&req); err != nil {
+		handleError(fmt.Errorf("parsing request body failed: %w", err),
+			http.StatusBadRequest, rw)
 		return
 	}
 
 	rw.Header().Add("Content-Type", "application/json")
 
-	selector := []string{rawCluster, rawNode}
-
 	ms := metricstore.GetMemoryStore()
-	if err := ms.HealthCheck(bufio.NewWriter(rw), selector); err != nil {
+	results, err := ms.HealthCheck(req.Cluster, req.Nodes, req.MetricNames)
+	if err != nil {
 		handleError(err, http.StatusBadRequest, rw)
 		return
 	}
+
+	rw.Header().Set("Content-Type", "application/json")
+	bw := bufio.NewWriter(rw)
+	defer bw.Flush()
+	if err := json.NewEncoder(bw).Encode(results); err != nil {
+		log.Print(err)
+		return
+	}
 }
diff --git a/internal/config/metricSchema.go b/internal/config/metricSchema.go
index 89c6fbf..8cfb705 100644
--- a/internal/config/metricSchema.go
+++ b/internal/config/metricSchema.go
@@ -18,7 +18,7 @@ var metricConfigSchema = `
       },
       "aggregation": {
         "description": "Aggregation strategy: 'sum', 'avg', or 'null'.",
-        "type": "string"
+        "type": ["string", "null"]
       }
     },
     "required": ["frequency", "aggregation"]