InfluxData uses Kafka as a sophisticated Write-Ahead-Log (WAL) to provide a multi-tenanted, horizontally scalable time series storage in InfluxDB Cloud 2.0, overcoming the limitations of traditional WALs such as scalability and durability issues. The use of Kafka enables InfluxDB Cloud 2.0 to meet several key requirements including multi-tenancy, elasticity, efficiency, robustness, tolerance, and isolation, by providing a distributed and battle-hardened solution that is faster than traditional WALs. The architecture leverages complex data partitioning handled by Kafka, with each partition replicated across multiple storage nodes, ensuring durability and scalability. Additionally, the use of Kafka enables efficient writes, robustness against failures, and isolation between tenants.