Install the Go agent in GAE flexible environment

With our Go agent, you can monitor applications that reside in the Google App Engine (GAE) flexible environment. Adding New Relic to your GAE flex app gives you insight into the health and performance of your app and extends GAE with metrics you can view in APM and browser monitoring.

Here we explain how to add New Relic to your GAE flex app by configuring a custom runtime, and give an example of deploying a Go app with Docker.

Build a custom runtime using Docker

See Google's documentation for building custom runtimes. This example describes how to add New Relic to your GAE flex app by installing the Go agent, building a custom Go runtime for Docker, and deploying a golang application.

For more information about deploying and configuring your Go app in the GAE flexible environment, see:

• Google App Engine's documentation for Go
• Google App Engine's tutorials to deploy a Go app

runtime: custom
env: flex

FROM golang:1.8-onbuild
CMD go run main.go

docker build --rm -t Docker-image-name .

Recommendation: Disable health checks

Google App Engine sends periodic health check requests to confirm that an instance has been successfully deployed, and to check that a running instance maintains a healthy status. A health check is an HTTP request to the URL /_ah/health.

If you create a custom runtime, your app must be able to handle a large number of health check requests. Otherwise, your app data may not display correctly in APM.

Recommendation: Configure your app.yaml to disable health checks by adding:

health_check:
  enable_health_check: False

Get agent troubleshooting logs from GAE

Use these resources to troubleshoot your GAE flex environment app:

• To connect to the GAE instance and start a shell in the Docker container running your code, see GAE's documentation for debugging an instance.

• To redirect New Relic Go agent logs to Stackdriver in the Cloud Platform Console, change the newrelic.yml file to:

  log_file_name: STDOUT

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