---
title: "Environments"
description: "Learn how to configure your SDK to tell Sentry about your environments."
url: https://docs.sentry.io/platforms/go/guides/negroni/configuration/environments/
---

# Environments | Sentry for Negroni

Environments tell you where an error occurred, whether that's in your production system, your staging server, or elsewhere.

Sentry automatically creates an environment when it receives an event with the `environment` parameter set.

Environments are case-sensitive. The environment name can't contain newlines, spaces or forward slashes, can't be the string "None", or exceed 64 characters. You can't delete environments, but you can [hide](https://docs.sentry.io/product/sentry-basics/environments.md#hidden-environments) them.

```go
sentry.Init(sentry.ClientOptions{
	// ...
	Environment: "production",
})
```

Environments help you better filter issues, releases, and user feedback in the Issue Details page of sentry.io, which you learn more about in our [documentation that covers using environments](https://docs.sentry.io/product/sentry-basics/environments.md).