AppRunner scaling logs

Question

Hello, I've got an AppRunner instance and I can see in the metrics that at times I've got an instance count of 3 (with a minimum configured at 1). Looking it up online, I should see scaling logs in the `events` stream in CloudWatch, but there's nothing in there.

I'm looking to measure how much time it takes for an instance to come up. I can see the application logs for the new instances and those are pretty fast, but need to measure how long the infra provisioning takes.

Do I need to enable any settings to get the scaling activity into logs and more importantly the instance state transitions?

learn2skills · Answer

Hello @Marius O

The console displays a few types of logs in several sections:
**Event log** – Activity in the lifecycle of your App Runner service. The console displays the latest events.
**Deployment logs** – Source repository deployments to your App Runner service. The console displays a separate log stream for each deployment.
**Application logs** – The output of the web application that's deployed to your App Runner service. The console combines the output from all running instances into a single log stream.

A deployment is a type of operation. **Deployment logs **contain the logging output of the build and deployment steps that App Runner performs when you create a service or deploy a new version of your application. Deployment log stream names start with deployment/, and end with the ID of the operation that performs the deployment. This operation is either a CreateService call for the initial application deployment or a StartDeployment call for each further deployment.

Ref: [https://docs.aws.amazon.com/apprunner/latest/dg/monitor-cwl.html](https://docs.aws.amazon.com/apprunner/latest/dg/monitor-cwl.html)

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AppRunner scaling logs

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