Grafana Mimir, an open-source, multi-tenant time series database, is undergoing architectural redesigns to enhance reliability and scalability as it celebrates its third anniversary. The changes aim to decouple the read and write paths to prevent disruptions caused by heavy queries and to simplify the management of ingester nodes. To achieve these objectives, Mimir's architecture is transitioning from Apache Kafka to WarpStream, a Kafka-compatible data streaming platform that reduces cross-availability zone costs and offers stateless, auto-scaling capabilities. This new architecture is being gradually implemented in Grafana Cloud Metrics, promising increased resilience to spikes in query traffic and data ingestion. The move is part of a broader effort to support future growth and meet stringent service-level agreements for customers, with ongoing testing and collaboration with the WarpStream team to ensure scalability. As the rollout progresses, users should eventually experience improved stability and performance, with the changes made available to the open-source community once fully validated.