基于Golang开发的微服务可以提供哪些可靠性功能？

package main

import (
    "context"
    "fmt"
    "net/http"
    "time"
)

func main() {
    // 创建一个带有超时时间的context
    ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
    defer cancel()

    // 启动一个goroutine执行耗时操作
    go func() {
        time.Sleep(3 * time.Second)
        fmt.Println("耗时操作完成")
    }()

    // 使用select语句等待操作完成或超时
    select {
    case <-ctx.Done():
        fmt.Println("操作超时")
    case <-time.After(5 * time.Second):
        fmt.Println("耗时操作完成")
    }
}

package main

import (
    "fmt"
    "time"

    "github.com/afex/hystrix-go/hystrix"
)

func main() {
    // 配置熔断器
    hystrix.ConfigureCommand("my_command", hystrix.CommandConfig{
        Timeout:               1000,
        MaxConcurrentRequests: 10,
        ErrorPercentThreshold: 25,
    })

    // 执行熔断器命令
    err := hystrix.Do("my_command", func() error {
        // 调用依赖的服务
        time.Sleep(2 * time.Second)
        return nil
    }, func(err error) error {
        // 降级处理
        fmt.Println("依赖服务不可用")
        return nil
    })

    if err != nil {
        fmt.Println("失败")
    }
}

package main

import (
    "fmt"
    "log"
    "net/http"
    "time"

    "github.com/opentracing/opentracing-go"
    "github.com/opentracing/opentracing-go/ext"
    "github.com/uber/jaeger-client-go"
    "github.com/uber/jaeger-client-go/config"
)

func main() {
    // 配置Jaeger tracer
    cfg := &config.Configuration{
        ServiceName: "my_service",
        Sampler: &config.SamplerConfig{
            Type:  jaeger.SamplerTypeConst,
            Param: 1,
        },
        Reporter: &config.ReporterConfig{
            LogSpans: true,
        },
    }
    tracer, closer, err := cfg.NewTracer(config.Logger(jaeger.StdLogger))
    if err != nil {
        log.Fatal(err)
    }
    defer closer.Close()

    // 注册全局tracer
    opentracing.SetGlobalTracer(tracer)

    // 创建一个HTTP请求
    req, _ := http.NewRequest("GET", "https://www.example.com", nil)

    // 创建一个span并设置相关属性
    span := tracer.StartSpan("http_request")
    defer span.Finish()
    ext.SpanKindRPCClient.Set(span)
    ext.HTTPUrl.Set(span, req.URL.String())
    ext.HTTPMethod.Set(span, req.Method)
    span.SetTag("my_tag", "my_value")

    // 模拟发送HTTP请求
    time.Sleep(1 * time.Second)

    fmt.Println("请求完成")
}