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feat: add scrape state metrics #1900

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feat: add scrape state metrics #1900

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catdogpandas
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@catdogpandas
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将 libcurl 的原始状态码返回，不要转换为字符串，映射转换为自监控指标，保证可控、枚举性，

@xdatcloud
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Reason 原因需要收敛下，比如我们通常遇到下面错误比较多：

● 401 / 403：采集作业需要配置正确的认证信息
● Connection Refused：目标端口未正常建立监听服务，通常服务发现配置出错，将它们排除即可
● Connection Timeout：通常是防火墙策略对探针拒绝访问，需要对探针放开、允许通信
● Request Timeout：采集超时，需调大采集间隔（scrape_interval）与采集超时（scrape_timeout）参数

正常情况下 status=OK，如果遇到错误可以整理成枚举值 ERR_CODE_401, ERR_CODE_403, ERR_CONN_REFUSED 等等，如果无命中当前枚举的统一用 status=ERR_UNKNOWN 处理

@catdogpandas
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在 4.x 中对应 aliyun_prometheus_agent_scrape_custom_error 指标

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@henryzhx8 henryzhx8 henryzhx8 left review comments

@linrunqi08 linrunqi08 linrunqi08 requested changes

@messixukejia messixukejia messixukejia requested changes

Requested changes must be addressed to merge this pull request.

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@catdogpandas @xdatcloud @messixukejia @henryzhx8 @linrunqi08