Cerulean is backed by Dendrite, which scales horizontally via Kafka, but is in beta: https://matrix.org/blog/2020/10/08/dendrite-is-entering-beta https://matrix

Cerulean is backed by Dendrite, which scales horizontally via Kafka, but is in beta: https://matrix.org/blog/2020/10/08/dendrite-is-entering-beta https://matrix.org/blog/2020/10/08/dendrite-is-entering-beta Most other production deployments of Matrix are backed by Synapse, which is out of beta, and which scales horizontally via Redis: https://matrix.org/blog/2020/11/03/how-we-fixed-synapses-scalability https://matrix.org/blog/2020/11/03/how-we-fixed-synapses-sca...