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# Unleash 4.21: Environment-dependent variants, visible API traffic, and service accounts

_Published 2023-03-01 by Michael Ferranti in Product._

Unleash 4.21 is out, and the theme of this update is fine-grained control.

## Evolve your variants independently with environment-dependent variants

Variants are now configurable by environment.

![Variants are now configurable by environment](https://cdn.getunleash.io/uploads/2023/03/image7.png)

Here’s why this is a good thing:

-   You can now modify variants in a specific environment, without forcing changes in other environments
-   You can further enforce fine-grained access control, like when a developer has access to development, but not production variants.
-   This means you can incorporate change requests into your variants.

This is a new approach to variants, and we’ve made some adjustments so that they’re easier to use and less prone to errors.

You’ll find that we’ve added some helpful features like **pushing** variants to another environment, or **copying** variants from an existing environment.

![Push or copy variants across environments](https://cdn.getunleash.io/uploads/2023/03/image8.png)

  
We’ve also made some small improvements to the UI. One notable improvement is the ability to check whether an environment has an active variant simply by hovering over it.

![](https://cdn.getunleash.io/uploads/2023/03/image5.png)

Don’t worry: There’s no need to migrate. If you have pre-existing variants, they’re all copied to your existing project variants.

Read more about how this works in our fantastic [documentation](https://docs.getunleash.io/reference/feature-toggle-variants).

## API traffic that you can see

You can now monitor your own Unleash API traffic directly through a quick overview tab.

![Monitor your own API traffic through an overview tab](https://cdn.getunleash.io/uploads/2023/03/image-3.png)

This is a minor improvement, but pretty great if you expect to experience a lot of traffic and want to know where it’s coming from.

![Quickly monitor your Unleash API traffic.](https://cdn.getunleash.io/uploads/2023/03/image9.png)

## Service accounts

This last is a feature for our enterprise users: use service accounts to give your integrations a user identity to work with.

![Service accounts give you a user identity to work with your integrations.](https://cdn.getunleash.io/uploads/2023/03/image2.png)

In a nutshell, you no longer have to create either a personal access token or an admin token for integrating with automations, monitoring systems, or other integrations.

This means you now have access to more fine-grained permissions than you’d normally get through [admin tokens.](https://docs.getunleash.io/reference/api-tokens-and-client-keys#admin-tokens)

![Get more fine-grained user control than you'd fine through admin tokens](https://cdn.getunleash.io/uploads/2023/03/image3.png)

Pretty great, right? As usual, you can read more about service accounts in our sweet [documentation](https://docs.getunleash.io/reference/service-accounts).

## In case you missed it: Mark your favorite feature flags

Unleash 4.20 brought the ability to pin your favorite feature flags by marking them with a star.

![Pin your favorite feature toggles with a star](https://cdn.getunleash.io/uploads/2023/03/image4.png)

This means you can also sort your feature flags by favorites. Everything after reverts back to default sorting.

You can also pin your favorite projects.

![You can also pin your favorite Projects](https://cdn.getunleash.io/uploads/2023/03/image1-1.png)

Every project not favorited will continue to be sorted alphabetically.

And that’s it for our 4.21 feature highlights. For a deep-dive look into everything in Unleash 4.21, check out our [release notes](https://github.com/Unleash/unleash/releases/tag/v4.21.0).