docs: optimize metrics document (#970)

* docs: optimize metrics document * docs: modified style * docs: modified style * Update USER_GUIDE.zh-CN.md * Update USER_GUIDE.zh-CN.md * Update USER_GUIDE.md Co-authored-by: 琚致远 <juzhiyuan@apache.org>
apache · Dec 10, 2020 · e611cd3 · e611cd3
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diff --git a/docs/USER_GUIDE.md b/docs/USER_GUIDE.md
@@ -23,6 +23,8 @@ The following are parts of the modules' snapshot.
 
 ## Metrics
 
+We support the monitor page by referencing it in [iframe](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe). Before accessing [Grafana](https://grafana.com/), please Enable [`allow_embedding=true`](https://grafana.com/docs/grafana/latest/administration/configuration/#allow_embedding), which defaults to `false`. This causes the browser to fail to render Grafana pages properly due to security policies.
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 ![metrics-en](./images/metrics-en.png)
 
 ## Route

diff --git a/docs/USER_GUIDE.zh-CN.md b/docs/USER_GUIDE.zh-CN.md
@@ -23,6 +23,8 @@
 
 ## 监控
 
+我们通过 [iframe](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe) 引用的方式以支持监控页，访问 [Grafana](https://grafana.com/) 前请启用 [`allow_embedding=true`](https://grafana.com/docs/grafana/latest/administration/configuration/#allow_embedding)，该配置项默认为 `false`，这将导致浏览器因安全策略而无法正常渲染 Grafana 页面。
+
 ![metrics-en](./images/metrics-en.png)
 
 ## 路由