doc: updated doc of zipkin. (#318)

README.md

@@ -48,6 +48,7 @@ For more detailed information, see the [White Paper](https://www.iresty.com/down
 - **Custom plugins**
 - **Anti-ReDoS(Regular expression Denial of Service)**
 - **[Health Checks](doc/health-check.md)**.
+- **[OpenTracing(Zipkin)](doc/plugins/zipkin.md)**.
 - **Caching**: TODO.
 - **Dashboard**: TODO.
 - **OAuth2.0**: TODO.

README_CN.md

@@ -45,6 +45,7 @@ APISIX 通过插件机制，提供动态负载平衡、身份验证、限流限
 - **自定义插件**
 - **防御 ReDoS(正则表达式拒绝服务)**
 - **[Health Checks](doc/health-check.md)**.
+- **[OpenTracing(Zipkin)](doc/plugins/zipkin.md)**.
 - **缓存**: TODO.
 - **管理控制台**: TODO.
 - **OAuth2.0**: TODO.

doc/plugins-cn.md

@@ -10,3 +10,4 @@
 * [limit-req](plugins/limit-req-cn.md): 基于漏桶原理的请求限速实现。
 * [limit-conn](plugins/limit-conn-cn.md): 限制并发请求（或并发连接）。
 * [prometheus](plugins/prometheus.md): 以 Prometheus 格式导出 APISIX 自身的状态信息，方便被外部 Prometheus 服务抓取。
+* [OpenTracing](plugins/zipkin.md): 支持 Zikpin 和 Apache SkyWalking。

doc/plugins.md

@@ -9,3 +9,5 @@ Now we support the following plugins:
 * [limit-req](plugins/limit-req.md): request rate limiting and adjustment based on the "leaky bucket" method.
 * [limit-conn](plugins/limit-conn.md): limite request concurrency (or concurrent connections).
 * [prometheus](plugins/prometheus.md): expose metrics related to APISIX and proxied upstream services in Prometheus exposition format, which can be scraped by a Prometheus Server.
+* [OpenTracing](plugins/zipkin.md): support Zikpin and Apache SkyWalking.
+

doc/plugins/zipkin.md

@@ -66,9 +66,9 @@ Then you can use a browser to access the webUI of Zipkin:
 http://127.0.0.1:9411/zipkin
 ```
 
-![](../../doc/images/plugin/zipkin-1.png)
+![](../../doc/images/plugin/zipkin-1.jpg)
 
-![](../../doc/images/plugin/zipkin-2.png)
+![](../../doc/images/plugin/zipkin-2.jpg)
 
 ## Disable Plugin