Metrictank has made significant improvements to its data import process for Grafana Cloud customers, particularly for those needing to migrate data from Graphite. Originally, Metrictank's importer tools were designed to move Whisper data into Cassandra, but with the addition of Bigtable and potential future stores, the tools have been refactored to support multiple storage options. The system uses a reader to handle data conversion and a writer to import data into Metrictank-supported stores. This setup allows for schema conversion, namespace adjustments, and efficient data transmission using gorilla-tsz encoding, thereby saving bandwidth and enhancing the flexibility of future data migrations. These upgrades not only facilitate seamless data migration across different database types but also optimize the use of existing stores with built-in enhancements, making the process more efficient for cluster migrations and other purposes.