Checkly has released a new runtime version 2021.10, which includes updated features such as the new Headers API and mouse wheel support in Playwright 1.15.2, as well as the addition of faker.js for generating fake data in check scripts. This release aims to bring users new features on a regular cadence while also providing security updates. The runtime environment is managed by Checkly, offering access to specific Node.js versions and NPM packages, allowing users to build checks with JavaScript code.