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The Cloud-Native Network Proxy Platform

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## 方案概述 + 删除MOSN扩展的context框架,原来使用扩展contextkey的地方,使用变量机制代替。 + 将MOSN 中的变量机制 (variable)和 内存复用框架 (buffer)迁移到 mosn.io/pkg 中 + 变量机制和内存复用框架用到了 context扩展框架,修改为 mosn.io/pkg/internal的内容,不再对外暴露 + 相关改动 https://github.com/mosn/pkg/pull/62 ## 变量框架改动 + 为了保证连接级别的数据(原部分ContextKey数据)与Stream级别的数据不互相干扰,同时Stream级别的Context又需要保持连接级别的数据,在NewVariableContext的时候,对数据进行了继承,同时通过Clone的方式确保新的ctx 不会对原来的ctx (parent)造成影响 + protocol resource部分,原来从contextkey获取协议的方式,改成了通过协议变量进行获取 + 新增了GetVariable/SetVariable接口,与原来的Get/Set接口相比,入参由name替换成了variable本身。这样做的好处是,可以提前保存变量(如全局),避免基于map进行索引,提高性能;不把Get/Set做成variable的方法,是因为variable是一个interface可能有不同的实现,但是Get/Set...

cla:yes
size/XXL

Support configure status codes in retry policy: ``` "retry_policy": { "num_retries": 3, "retry_on": true, "retry_timeout": "1s", "status_codes": [ 404, 502, 504 ] } ``` depends on https://github.com/mosn/api/pull/48

cla:yes
size/S

In some tracing strategies, infos in response headers will be needed. depend on https://github.com/mosn/api/pull/49

cla:yes
size/XS

ref: https://github.com/mosn/mosn/pull/2024#issuecomment-1122099009

### Describe the bug A clear and concise description of what the bug is. 某客户私有协议tcp扩展,并且采用短连接场景(ping-pong),服务方在响应完后会主动close链接,mosn侧会导致请求丢失 mosn xprotocol pingpong connpool 拿到服务用tcp发送报文,等待Notify ![image](https://user-images.githubusercontent.com/15549777/180915361-b6f09c2c-63f7-467c-98af-0ec082ed7fcb.png) 服务方在处理掉response请求后,发送fin close链接,导致mosn的请求丢失 ![image](https://user-images.githubusercontent.com/15549777/180915425-b05009a3-d31a-4dd4-94f0-c5dae9e158f3.png) 背景已同步给 永鹏 ### Expected behavior 1....

kind/enhancement

### The New Feature Logs are rotated according to time rules, and supports limiting the maximum number of logs and whether to compress them ### Your scenes Common O&M Requirements...

kind/feature

### Your question MOSN不支持pilot-agent的prometheus合并请求 /stats/prometheus ### Environment - MOSN 1.0.0 ### Logs ![image](https://user-images.githubusercontent.com/33600025/179497520-ff451aef-4e72-4f8c-a234-2ec4e9d3f659.png)

https://github.com/mosn/mosn/blob/857883d30d979cd5249b96bd857c38cc0b4b3e40/pkg/istio/xds.go#L99

比如Auto协议识别`proxy.go:OnData` 在报错的时候,额外输出一下对应proxy的连接信息,这样可以更快速的定位到是哪个客户端发送了错误的数据