diff --git a/server/model/monitor.js b/server/model/monitor.js
index 5a04b3833..48bd5a4cc 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -466,11 +466,16 @@ class Monitor extends BeanModel {
     stop() {
         clearTimeout(this.heartbeatInterval);
         this.isStop = true;
+
+        this.prometheus().remove();
     }
 
     onDelete() {
-        let prometheus = new Prometheus(this);
-        prometheus.remove();
+        this.prometheus().remove();
+    }
+
+    prometheus() {
+        return new Prometheus(this);
     }
 
     /**
diff --git a/server/server.js b/server/server.js
index db985c439..fbf0a06e0 100644
--- a/server/server.js
+++ b/server/server.js
@@ -567,6 +567,11 @@ exports.entryPage = "dashboard";
                     throw new Error("Permission denied.");
                 }
 
+                // Reset Prometheus labels
+                if (monitorList[monitor.id] && monitorList[monitor.id].prometheus) {
+                    monitorList[monitor.id].prometheus().remove();
+                }
+
                 bean.name = monitor.name;
                 bean.type = monitor.type;
                 bean.url = monitor.url;