New Relic Go Custom Instrumentation

gistfile1.txt

package main

import (
        "context"
        "fmt"

        "github.com/newrelic/go-agent/v3/integrations/nrlambda"
        "github.com/newrelic/go-agent/v3/newrelic"
)

var (
        app *newrelic.Application
        err error
)

func init() {
        app, err = newrelic.NewApplication(nrlambda.ConfigOption(), newrelic.ConfigDebugLogger(os.Stdout))
        if nil != err {
                fmt.Println("Error creating app (invalid config): ", err)
        }
}

func handler(ctx context.Context) (string, error) {
        // At this point, we're handling an invocation. Cold start is over; this code runs for each invocation.
        // We'd like to add a custom event, and a custom attribute. For that, we need the transaction.
        if txn := newrelic.FromContext(ctx); nil != txn {
                // This is an example of a custom event. `FROM MyGoEvent SELECT *` in New Relic will find this event.
                txn.Application().RecordCustomEvent("MyGoEvent", map[string]interface{}{
                        "zip": "zap",
                })

                // This attribute gets added to the normal AwsLambdaInvocation event
                txn.AddAttribute("customAttribute", "customAttributeValue")
        }

        // As normal, anything you write to stdout ends up in CloudWatch
        fmt.Println("hello world!")

        return "Success!", nil
}

func main() {
        nrlambda.Start(handler, app)
}