Temporal introduces Multi-region Namespaces in Public Preview, offering a contractual service level agreement (SLA) of 99.99% guarantee against service errors. This is achieved through an "active-standby" setup managed by Temporal, which replicates workflows to a standby region and seamlessly fails over during outages or incidents in the active region. Multi-region Namespaces provide customers with reduced risk, minimal operational disruption, and no manual deployment, configuration, or code changes needed. The feature has been tested for over a year through Temporal's own replication technology.