add otel metrics for spiderpool

[Icarus9913]

Signed-off-by: Icarus9913 [email protected]

Add otel metrics module for spiderpool to monitor.

• [x] Test

[weizhoublue]

每个函数的健壮性不好，没有入参校验，错误了没有抛给外部 单元测试太简单，需要有正向和反向用例，甚至是并发竞争，且覆盖率100%

[Icarus9913]

metric 部分的设计，是否应该做成不对业务影响的模块，不耦合？对此，我只在新建接口时才有过一次err异常抛出。 指标收集部分的代码是插入在业务代码中，应该仅作为一个插入，而不应该对业务层有err介入，否则写业务会因为没有记录到指标而抛异常？我的想法是，中间键部分的代码，仅仅作为业务代码部门的某一两行的污染，若有异常应log指出。不应让其err影响到业务层？

[weizhoublue]

不让外部感知 erro 不叫 “不耦合”，外部不要 call function call 才叫 不耦合 没见过哪个 开源的 module 能自己内部消化掉 error，整个 function call 都失败了，还完全不让外部感知 应该要 传递 error 出来 ， 上层 业务 是否 忽略或处理，是上层的事，打印出错也可以上 层自己的logger 来控制 。 不需要 本pkg 操心 error 的处理，否则外部业务 完全丧失控制

[codecov[bot]]

Codecov Report

Merging #81 (0a8b6d0) into main (1621ec6) will increase coverage by 3.94%. The diff coverage is 92.68%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   77.58%   81.52%   +3.94%     
==========================================
  Files           2        3       +1     
  Lines         116      157      +41     
==========================================
+ Hits           90      128      +38     
- Misses         19       21       +2     
- Partials        7        8       +1     

Flag	Coverage Δ
unittests	81.52% <92.68%> (+3.94%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/metrics/metrics.go	92.68% <92.68%> (ø)

[Icarus9913]

对于metrics的unitest记录某种指标是否成功记录/消费的验证，otel库目前缺少该功能。已有其他contributor提过该类的issue和pr，但是还没有merge。 https://github.com/open-telemetry/opentelemetry-go/pull/2776

[weizhoublue]

有冲突了，解决下

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[github-actions[bot]]

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