> Markdown version of https://www.getunleash.io//blog/unleash-5-7 > For clean Markdown of any blog post, append .md to its URL. > For a site index, see https://www.getunleash.io//llms.txt. # Unleash 5.7: Managing Large Releases, Measuring Lead Time for Changes, Improved Troubleshooting and More _Published 2023-12-04 by Michael Ferranti in Product._ Unleash 5.7 was released last week, and we have new tools and iterative improvements to share with you. To help teams release several features simultaneously, Unleash 5.7 introduces [Dependent Feature flags](https://docs.getunleash.io/concepts/feature-flags#feature-flag-dependencies), which allow you to define a child flag that depends on a parent flag. We’re excited to debut our [DORA metrics](https://cloud.google.com/blog/products/devops-sre/using-the-four-keys-to-measure-your-devops-performance) dashboard, starting by measuring **Lead Time for Changes**; we know that Unleash improves engineering performance and expect to help quantify some of that impact with this new metrics dashboard. Unleash 5.7 also improves the [Playground](https://docs.getunleash.io/reference/playground), our tool that shows which of your instance’s feature toggles would be enabled for a given Unleash context. We also enhanced the Last Seen functionality to provide more insights into how your flags are working. Finally, we’ve also added [Banners](https://docs.getunleash.io/reference/banners) to help you communicate with all users of your Unleash Admin UI. ## Managing Large Releases with Dependent Flags **Version: Pro + Unleash Enterprise** With Unleash 5.7, creating [child flags](https://docs.getunleash.io/concepts/feature-flags#feature-flag-dependencies) that depend on a parent flag is now possible. For the flag to be enabled, both the parent and child conditions must be met. ![Feature Toggle: Add parent feature](https://cdn.getunleash.io/uploads/2023/12/image9-300x134.png) This functionality will help teams who need to manage releases of several features at once. This is especially helpful if you also need to help coordinate across teams, countries, or departments. We expect another everyday use case will be a Kill Switch that toggles many pieces simultaneously. Because dependent flags introduce new logic, using them will require SDK updates; [check the documentation](https://docs.getunleash.io/concepts/feature-flags#feature-flag-dependencies) for more information. Currently, parent and child must be in the same project, only one parent is allowed per child, and there is only one level of parent > child dependencies (no grandparents). ![Add parent feature dependency dialogue screen](https://cdn.getunleash.io/uploads/2023/12/image11-1024x821.png) ## Measuring Lead Time for Changes from DORA Metrics **Version: Unleash Enterprise** Unleash 5.7 introduces a new [DORA metrics](https://cloud.google.com/blog/products/devops-sre/using-the-four-keys-to-measure-your-devops-performance) dashboard to help quantify organizational performance for our Enterprise customers. DORA Metrics can help measure DevOps efficiency and communicate performance to business stakeholders. This is a new feature, and we’re actively gathering feedback to help us improve functionality and utility. Currently, the dashboard calculates one of the DORA metrics: “**Lead Time for Changes**” per feature, which tracks the time it takes a commit to get into production. Give it a look, and let us know what you think! ![Metrics screen](https://cdn.getunleash.io/uploads/2023/12/image8-1024x972.png) ## Playground Improvements **Version: Open Source + Pro + Unleash Enterprise** The Playground was first introduced in version 4.14 to help you see which of your instance’s feature flags would be enabled for a given Unleash [context](https://docs.getunleash.io/reference/unleash-context). It has multiple uses, such as: - Understanding how Unleash evaluates strategies, constraints, and segments. - Debugging Unleash contexts and flags behaving differently from what you expect. - Tailoring a set of strategies for given contexts. In Unleash 5.7, we’ve made several additional improvements, and the Playground now displays disabled strategies to see what is happening more fully. ![Playground evaluation of abc.funFlag](https://cdn.getunleash.io/uploads/2023/12/image4-1012x1024.png) To simplify debugging, a new option is available to provide a token for the evaluation process. This token will grant the evaluation the same level of access that the token has to run against. ![Unleash Playground screenshot showing the API Token field](https://cdn.getunleash.io/uploads/2023/12/image6-1024x572.png) ## Consistency and Understandability with Flag Naming Patterns **Version: Unleash Enterprise** Many Enterprise customers have asked us for ways to set flag naming patterns, and Unleash 5.7 delivers just that. On a per-project basis, you can now enforce naming conventions with a JavaScript RegEx pattern and help text and examples to help users understand the pattern. ![Feature flag naming patterns dialogue](https://cdn.getunleash.io/uploads/2023/12/image7-1024x744.png) ## Communication Banners **Version: Unleash Enterprise** Finally, we’re pleased to share new [Banners](https://docs.getunleash.io/reference/banners) that can help you communicate with users of the Admin UI. This feature enables Enterprise customers to display interactive banners on their Unleash instance for all users. There are four different types of banners, each with their own styling and intent: - **Information** - **Warning** - **Error** - **Success** They can also include icons, links, and dialogues for rich functionality. ![Creating a Banner ](https://cdn.getunleash.io/uploads/2023/12/image10-1024x860.png) ![Image of Banners in use](https://cdn.getunleash.io/uploads/2023/12/image2-1024x565.png) ## Last Seen by Environment **Version: Open Source + Pro + Unleash Enterprise** The ‘Last Seen’ function now provides more insight into how your flags work by showing the environment in which they were seen. This will identify flags that require clean-up in a specific environment. ![Last Seen by Environment](https://cdn.getunleash.io/uploads/2023/12/image1.png)