What Kubernetes concept maps naturally onto 'a consumer instance that needs a stable identity across restarts', and why might that matter for Kafka?

A `StatefulSet` gives each pod a stable, predictable network identity and ordinal index across restarts, which matters if you rely on that identity for manual partition assignment or for correlating a specific consumer instance with monitoring/logs — a plain `Deployment`'s pods get arbitrary, changing names on every restart, which works fine for most Kafka consumers but not ones that need pinned identity.