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• Multi-cluster services provide a way to uniquely identify replicas across clusters and discover endpoints.
• Staple set slices allow for granular control over replica ordinal and scaling in complementary fashion.
• Coordinating building blocks and migrating dependencies are necessary for cross-cluster migration.
• Challenges of cross-cluster migration include managing multiple Kubernetes control planes and client-side Quorum.
• Stateful workloads require unique solutions for cross-cluster migration.
• An anecdote is provided about the complexity of migrating a metrics datastore between Kubernetes clusters.