Scalability in the data plane is easy to achieve by simply having more replicas. The configuration the proxies receive from the control plane makes that possible . However, if the number of services (and their sidecar proxies) get too big, the control plane can become a bottleneck by not being able to send metrics or other configuration data fast enough to the sidecars.
Is there a possibility to horizontally scale the control plane of a service mesh so that the total amount of possible services can be increased? I didn't find anything regarding that.