Have you used shared runners in GitLab CI/CD in your practice?

Yes, shared runners in GitLab CI/CD are used to execute jobs from different projects on one or more common servers.

They allow centralized management of the infrastructure for running pipelines without configuring runners for each project separately. This is convenient for teams and organizations with many projects and the need to optimize resource usage.

For example, if you have several projects, you can register one shared runner that will handle tasks from all these projects, simplifying administration and saving time.

You can also configure runner tags to run only specific jobs and restrict access by projects.

Using shared runners is especially useful in large teams and when using GitLab SaaS, where such runners are provided by default.