It is awesome CircleCI natively implemented queue for jobs. One of the main feature of the eddiewebb/queue orb was ability to skip some jobs conditionally, so if one instance of the job is running, other instances will be skipped completely. Unfortunately, this option is missing in a new feature provided by CircleCI. Use case is next: we have different workflows (let's name them 1, 2, 3, 4) to build and deploy different part of our application. At the end of each workflow end-to-end tests will be triggered (technically it's implemented as a call to run another workflow with tests, let's name it T). When some of workflows running simultaneously, they will call tests several times in a short period of time. Obviously that in this case we only need single test execution, not all of them. My suggestion is to add a 'add-to-queue' parameter to a 'serial-group' key add-to-queue: type: enum enum: ["all", "none", "latest"] default: all description: "Parameter that defines if new instances of the job should be added to the queue all - when job (1) is running, and job (2) and (3) and (4) triggered - in this case all new instances of the job (2) and (3) and (4) will be added to the queue none - when job (1) is running, and job (2) and (3) and (4) triggered - in this case no new instances of the job will be added to the queue, all jobs (2) and (3) and (4) will be cancelled latest - when job (1) is running, and job (2) and (3) and (4) triggered - in this case only the latest instance (4) will be added to the queue, and all other instances between (1) and (4) will be cancelled. In case job (1) is still running and instance (5) triggered, it will be added to the queue and instance (4) will be cancelled"