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In Prefect 3, it seems that the `run_deployment` function is still present, but there have been reported issues with using it across different versions of Prefect. Especially, there are incompatibility issues when using `run_deployment` with Prefect 3.X to run deployments that were originally set up with Prefect 2.X, which can lead to errors such as a `TypeError` <https://github.com/PrefectHQ/prefect/issues/15694|GitHub Issue>. Additionally, there are other issues related to running subflows in parallel and using a self-hosted Prefect server with `run_deployment` <https://github.com/PrefectHQ/prefect/issues/15780|GitHub Issues>, <https://github.com/PrefectHQ/prefect/issues/15415|GitHub Issues Subflows>.

Unfortunately, direct documentation search in Prefect 3.x did not yield specific instructions on how to import or use `run_deployment`. You may want to further explore the Prefect 3.x documentation or community forums for more detailed guidance on usage within this version.

To access updated Prefect documentation and examples, consider visiting: <https://docs-3.prefect.io/|Prefect 3.x Documentation>.

If these reported issues affect your use case, you might want to keep an eye on the Prefect GitHub repository for updates or potential patches.