Indeed, all major Service Meshes solution for Kubernetes implements (at least some part) the SMI specification. There is a group composed of these players work

Indeed, all major Service Meshes solution for Kubernetes implements (at least some part) the SMI specification. There is a group composed of these players working actively on making such spec a standard. Understanding these few CRDs give great insights on what do expect from a Service mesh and how thinks are typically articulated.