Active-active edge config replication

Design an active-active geo-replicated key-value store for edge configuration (routing rules, WAF policies, rate-limit configs) served from 200+ edge POPs. Operators in any region can update config, all edges must converge to the same final state within seconds, and an edge must keep serving its last-known config even if fully partitioned from the control plane. Updates are infrequent but correctness of the final converged state is critical. How do you replicate and resolve concurrent edits?