Hi
@James Cole in order to off-the-shelf prevent runs from starting at the same time it would require a system for locking the concurrency of the flows. Right now there are flow level concurrency limits in the Prefect Cloud offering and considerations to include them in Prefect server (
https://github.com/PrefectHQ/server/issues/81)
There is also a more granular concurrency limiting feature in Prefect Cloud that allows you to limit the global concurrency of certain
tasks based on their tags, but access to this feature requires an appropriate Cloud license.