Monitor Negroni in Go Applications with Atatus Go Agent

Installation steps

Install Atatus Go Agent and framework module

copy
```
go get go.atatus.com/agent
go get go.atatus.com/agent/module/atnegroni
```

Set up tracer and add Atatus middleware

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import (
    "github.com/urfave/negroni/v3"

    "go.atatus.com/agent"
    "go.atatus.com/agent/module/atnegroni"
)

func main() {

    // Initialize Atatus tracer using environment variables
    tracer := atatus.DefaultTracer
    tracer.Service.LicenseKey = os.Getenv("ATATUS_LICENSE_KEY")
    tracer.Service.AppName = os.Getenv("ATATUS_APP_NAME")
    tracer.Service.Tracing = os.Getenv("ATATUS_TRACING")
    tracer.Service.Analytics = os.Getenv("ATATUS_ANALYTICS")

    // Setup Negroni router and apply Atatus middleware
    mux := http.NewServeMux()
    mux.HandleFunc("/things", handleRequest)

    n := negroni.New()
    n.Use(atnegroni.Middleware())
    n.UseHandler(mux)

    http.ListenAndServe(":8080", n)
}

func handleRequest(w http.ResponseWriter, r *http.Request) {
  // The context from r.Context() should be propagated to downstream operations,
  // such as database queries and external HTTP API calls
    ctx:= r.Context()
  _ = db.QueryContext(ctx, "SELECT 'Atatus!'").Scan(&greeting)
}

Clean Up and Sync Dependencies

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```
go mod tidy
```
Run the Application

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```
go run main.go
```