docs: Update CHANGELOG for release v3.1.1-rc1 (#2530)

The CHANGLOG was updated to contain features, bugfixes and enhancements
of release v3.1.1-rc1.

Signed-off-by: Xuewei Niu <[email protected]>

Author: justxuewei

CHANGELOG.md

@@ -1,6 +1,53 @@
 # Release Notes
 ---
 
+## 3.1.1-rc1
+
+### Features
+
+- [Wrapper sliding window with custom aggregator](https://github.com/apache/dubbo-go/pull/2358)
+- [Wrapper sliding window with custom counter for caculating QPS](https://github.com/apache/dubbo-go/pull/2359)
+- [Add some metrics](https://github.com/apache/dubbo-go/pull/2362)
+- [Add registry metrics](https://github.com/apache/dubbo-go/pull/2366)
+- [Add metadata rt metrics](https://github.com/apache/dubbo-go/pull/2363)
+- [Add medata and config center metrics](https://github.com/apache/dubbo-go/pull/2357)
+- [Introduce metrics bus](https://github.com/apache/dubbo-go/pull/2351)
+- [Add metrics base api interface](https://github.com/apache/dubbo-go/pull/2350)
+- [Implement meta cache](https://github.com/apache/dubbo-go/pull/2371)
+- [Add prometheus pushgateway support](https://github.com/apache/dubbo-go/pull/2415)
+- [Add switch for metric collector](https://github.com/apache/dubbo-go/pull/2424)
+- [Add rpc exception metrics](https://github.com/apache/dubbo-go/pull/2459)
+
+### BugFixes
+
+- [Cache manager test](https://github.com/apache/dubbo-go/pull/2383)
+- [Fix an issue that random ports can't be assgined](https://github.com/apache/dubbo-go/pull/2384)
+- [Fix variable name typo](https://github.com/apache/dubbo-go/pull/2389)
+- [Fix registry primitiveURL](https://github.com/apache/dubbo-go/pull/2385)
+- [Fix health.proto has name conflict with the one in google.golang.org/grpc](https://github.com/apache/dubbo-go/pull/2395)
+- [Rename 'one' to 'cacheOnce'](https://github.com/apache/dubbo-go/pull/2423)
+- [Fix config random port](https://github.com/apache/dubbo-go/pull/2436)
+- [Fix ConsumerConfig nil pointer problem](https://github.com/apache/dubbo-go/pull/2440)
+- [Limit header size to avoid unexpected OOM](https://github.com/apache/dubbo-go/pull/2466)
+- [Fix zookeeper and nacos issues working as registry, metadata and configcenter](https://github.com/apache/dubbo-go/pull/2369)
+- [Fix service discovery subscription](https://github.com/apache/dubbo-go/pull/2480)
+
+### Enhancements
+
+- [Make rt metric more performance and easy to use](https://github.com/apache/dubbo-go/pull/2376)
+- [Migrate old RT metric impl to new RT impl](https://github.com/apache/dubbo-go/pull/2390)
+- [Nacos support subscribe to all with '*'](https://github.com/apache/dubbo-go/pull/2374)
+- [Optimize the integration of otel tracing](https://github.com/apache/dubbo-go/pull/2387)
+- [Add fmt make task](https://github.com/apache/dubbo-go/pull/2401)
+- [Rewrite RPC metrics into the event pattern](https://github.com/apache/dubbo-go/pull/2392)
+- [Change metric config to url like other module](https://github.com/apache/dubbo-go/pull/2396)
+- [Simplify configuration when enable metrics](https://github.com/apache/dubbo-go/pull/2408)
+- [Remove redundant nil check in Init](https://github.com/apache/dubbo-go/pull/2412)
+- [Improve cache init time and add application name](https://github.com/apache/dubbo-go/pull/2420)
+- [Zk registry support customize 'rootPath'](https://github.com/apache/dubbo-go/pull/2437)
+- [Refactor metrics config](https://github.com/apache/dubbo-go/pull/2465)
+- [Improve tag and configurator rules to keep up with official site](https://github.com/apache/dubbo-go/pull/2330)
+
 ## 3.1.0
 
 ### Features