Instrument Go apps for Error Reporting

You can send error reports to Error Reporting from Go applications by using the Error Reporting package for Go. Use the Error Reporting package for Go to create error groups for the following cases:

• A log bucket that contains your log entries has customer-managed encryption keys (CMEK).
• The log bucket satisfies one of the following:
  • The log bucket is stored in the same project where the log entries originated.
  • The log entries were routed to a project, and then that project stored those log entries in a log bucket that it owns.
• You want to report custom error events.

Error Reporting is integrated with some Google Cloud services, such as Cloud Functions and App Engine, Compute Engine, and Google Kubernetes Engine. Error Reporting displays the errors that are logged to Cloud Logging by applications running on those services. For more information, go to Running on Google Cloud on this page.

You can also send error data to Error Reporting using Logging. For information on the data formatting requirements, read Formatting error messages in Logging.

Before you begin

1. Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

   Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

   Go to project selector

3. Make sure that billing is enabled for your Google Cloud project.

4. Enable the Error Reporting API .

   Enable the API

5. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

   Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

   Go to project selector

6. Make sure that billing is enabled for your Google Cloud project.

7. Enable the Error Reporting API .

   Enable the API

Install the client library

The Error Reporting package for Go lets you monitor and view errors reported by Go applications running nearly anywhere.

1. Use go get to install the package:

   go get cloud.google.com/go/errorreporting

For more information on installation, read the documentation for the Error Reporting package for Go. You can also report issues using the issue tracker.

Configure the client library

You can customize the behavior of the Error Reporting package for Go. See the godoc.

Run apps on Google Cloud

To create error groups by using projects.events.report, your service account requires the Error Reporting Writer role (roles/errorreporting.writer).

Some Google Cloud services automatically grant the Error Reporting Writer role (roles/errorreporting.writer) to the appropriate service account. However, you must grant this role to the appropriate service account for some services.

Cloud Run and Cloud Run functions

The default service account used by Cloud Run has the permissions of Error Reporting Writer role (roles/errorreporting.writer).

The Error Reporting package for Go can be used without needing to explicitly provide credentials.

Cloud Run is configured to use Error Reporting automatically. Unhandled JavaScript exceptions will appear in Logging and be processed by Error Reporting without needing to use the Error Reporting package for Go.

Note: Log entries are processed automatically if they contain a stack trace and they specify either no log severity or a log severity of at least ERROR, without needing to use the Error Reporting package for Go.

App Engine flexible environment

App Engine grants the Error Reporting Writer role (roles/errorreporting.writer) to your default service account automatically.

The Error Reporting package for Go can be used without needing to explicitly provide credentials.

Error Reporting is automatically enabled for App Engine flexible environment applications. No additional setup is required.

Note: Error log entries written to stderr are processed automatically by Error Reporting, without needing to use the Error Reporting package for Go directly.

Google Kubernetes Engine

To use Error Reporting with Google Kubernetes Engine, do the following:

1. Ensure that the service account to be used by your container has been granted the Error Reporting Writer role (roles/errorreporting.writer).

   You can use either the Compute Engine default service account or a custom service account.

   For information about granting roles, see Manage access to projects, folders, and organizations.

2. Create your cluster and grant the cluster the cloud-platform access scope.

   For example, the following create command specifies the cloud-platform access scope and a service account:

   gcloud container clusters create CLUSTER_NAME --service-account  SERVICE_ACCT_NAME --scopes=cloud-platform
   

Note: After you create a cluster, you can't change its service account.

Compute Engine

To use Error Reporting with Compute Engine VM instances, do the following:

1. Ensure that the service account to be used by your VM instance has been granted the Error Reporting Writer role (roles/errorreporting.writer).

   You can use either the Compute Engine default service account or a custom service account.

   For information about granting roles, see Manage access to projects, folders, and organizations.

2. In the Google Cloud console, go to the VM instances page:

   Go to VM instances

   If you use the search bar to find this page, then select the result whose subheading is Compute Engine.

3. Select the VM instance that you want to receive the cloud-platform access scope.

4. Click Stop, and then click Edit.

5. In the Identity and API access section, select a service account that has the Error Reporting Writer role (roles/errorreporting.writer).

6. In the Access scopes section, select Allow full access to all Cloud APIs, and then save your changes.

7. Click Start/Resume.

Example

The following sample demonstrates using the Go client library to report a custom error event:

// Sample errorreporting_quickstart contains is a quickstart
// example for the Google Cloud Error Reporting API.
package main

import (
	"context"
	"errors"
	"log"
	"os"

	"cloud.google.com/go/errorreporting"
)

var errorClient *errorreporting.Client

func main() {
	// Set your Google Cloud Platform project ID via environment or explicitly
	projectID := os.Getenv("GOOGLE_CLOUD_PROJECT")
	args := os.Args[1:]
	if len(args) > 0 && args[0] != "" {
		projectID = args[0]
	}

	ctx := context.Background()
	var err error
	errorClient, err = errorreporting.NewClient(ctx, projectID, errorreporting.Config{
		ServiceName:    "errorreporting_quickstart",
		ServiceVersion: "0.0.0",
		OnError: func(err error) {
			log.Printf("Could not report the error: %v", err)
		},
	})
	if err != nil {
		log.Fatal(err)
	}
	defer errorClient.Close()

	err = errors.New("something went wrong")
	if err != nil {
		logAndPrintError(err)
		return
	}
}

func logAndPrintError(err error) {
	/// Client autopopulates the error context of the error. For more details about the context see:
	/// https://cloud.google.com/error-reporting/reference/rest/v1beta1/ErrorContext
	errorClient.Report(errorreporting.Entry{
		Error: err,
	})
	log.Print(err)
}

See the godoc for more examples of how to report panics and errors.

Run apps in a local development environment

To use the Error Reporting package for Go in a local development environment, such as running the library on your own workstation, you must provide your Error Reporting package for Go with the local application default credentials. For more information, see Authenticate to Error Reporting.

To use the Go samples on this page in a local development environment, install and initialize the gcloud CLI, and then set up Application Default Credentials with your user credentials.

1. Install the Google Cloud CLI.

2. To initialize the gcloud CLI, run the following command:

   gcloud init

3. If you're using a local shell, then create local authentication credentials for your user account:

   gcloud auth application-default login

   You don't need to do this if you're using Cloud Shell.

   Note: If the gcloud CLI prints a warning that your account doesn't have the serviceusage.services.use permission, then some gcloud CLI commands and client libraries might not work. Ask an administrator to grant you the Service Usage Consumer IAM role (roles/serviceusage.serviceUsageConsumer), then run the following command:

   gcloud auth application-default set-quota-project PROJECT_ID

For more information, see Set up authentication for a local development environment.

The projects.events.report method also supports API keys. If you want to use API keys for authentication, you do not need to set up a local Application Default Credentials file. For more information, see Create an API key in the Google Cloud authentication documentation.

Viewing error reports

In the Google Cloud console, go to the Error Reporting page:

Go to Error Reporting

You can also find this page by using the search bar.

For more information, see Viewing Errors.