Prom-migrator is a universal, open-source Prometheus data migration tool that's community-driven and free to use. With Prom-migrator, users can move their data from Prometheus to the long-term storage of their choice or migrate between different long-term storage options. The tool addresses the need for a universal tool to migrate data between various Prometheus-compatible remote storage systems. It features data migration from and to any storage system, informative outputs during runtime, ability to resume migration in case of interruptions, stateless working model, and compatibility with other databases. Prom-migrator works by iteratively pulling data from a remote storage system using the `remote_read` endpoint for a certain time-range and then pushing it to another remote storage system using the `remote_write` endpoint. The tool is designed to work with any remote storage system, making it suitable for various migration scenarios.