Kubernetes Ingress and Service Mesh
https://tetrate.io/learn/kubernetes/w...
The service mesh focuses on east-west traffic, i.e., traffic within a Kubernetes cluster, but most service meshes, including Istio, also provide ingress functionality, originally using the Ingress API, with most also adopting the newer Kubernetes Gateway API.
The older Kubernetes Ingress API has been superseded by the newer Gateway API, which provides a more comprehensive, unified, and standardized API for managing traffic into and out of a Kubernetes cluster.
The Gateway API provides a new reference model for the convergence of ingress gateways (north-south) and service mesh (east-west, cross-cluster routing).