---
description: Set observability for individual container applications in Wrangler.
title: Configure observability per container application
image: https://developers.cloudflare.com/changelog/post/2026-09-08-per-container-observability/og.png?v=9b80feee07ec5ff3
---

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September 8, 2026

## Configure observability per container application

[Containers](https://developers.cloudflare.com/containers/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2026-09-08-per-container-observability/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

You can now configure observability for each container application when you deploy [Containers](https://developers.cloudflare.com/containers/) with [Wrangler](https://developers.cloudflare.com/workers/wrangler/). This lets you change logging for one container without changing the rest of your Worker.

If you omit `containers[].observability`, Wrangler uses the top-level `observability` setting for that container. If you set it, the container setting overrides the top-level setting.

Use `target_instance_percentage` or `target_instance_count` to apply an observability change to a subset of running instances.

```jsonc
{
	"observability": {
		"enabled": false,
	},
	"containers": [
		{
			"class_name": "MyContainer",
			"image": "./Dockerfile",
			"observability": {
				"enabled": true,
				"target_instance_percentage": 25,
			},
		},
	],
}
```

```toml
[observability]
enabled = false

[[containers]]
class_name = "MyContainer"
image = "./Dockerfile"

  [containers.observability]
  enabled = true
  target_instance_percentage = 25
```

For more information about Workers Logs, refer to [Workers Logs](https://developers.cloudflare.com/workers/observability/logs/workers-logs/).

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