diff --git a/platform/observability/grafana/values.yaml b/platform/observability/grafana/values.yaml
index a598e2a..f9bae58 100644
--- a/platform/observability/grafana/values.yaml
+++ b/platform/observability/grafana/values.yaml
@@ -32,6 +32,14 @@ datasources:
         isDefault: true
         jsonData:
           prometheusType: Prometheus
+      - name: Alertmanager
+        uid: alertmanager
+        type: alertmanager
+        access: proxy
+        url: http://vmalertmanager-main.monitoring.svc:9093
+        jsonData:
+          implementation: prometheus
+          handleGrafanaManagedAlerts: false
       - name: VictoriaLogs
         type: victoriametrics-logs-datasource
         access: proxy
diff --git a/platform/observability/metrics/vmalert.yaml b/platform/observability/metrics/vmalert.yaml
index e35018b..758c42b 100644
--- a/platform/observability/metrics/vmalert.yaml
+++ b/platform/observability/metrics/vmalert.yaml
@@ -10,6 +10,11 @@ spec:
   replicaCount: 1
   selectAllByDefault: true
   evaluationInterval: 30s
+  # 告警 Source 复用已认证的 Grafana 入口，携带表达式和触发时间。
+  # 整个 Explore JSON 一次性 URL 编码，避免表达式中的引号、&、+ 损坏链接。
+  extraArgs:
+    external.url: https://grafana.ad.ddupan.top
+    external.alert.source: 'explore?left={{ printf "{\"datasource\":\"VictoriaMetrics\",\"queries\":[{\"expr\":%s,\"refId\":\"A\"}],\"range\":{\"from\":\"%d\",\"to\":\"now\"}}" (.Expr | jsonEscape) .ActiveAt.UnixMilli | queryEscape }}'
   datasource:
     url: http://vmsingle-main.monitoring.svc:8428
   remoteWrite: