In GKE version 1.32.2-gke.1652000 and later, new external LoadBalancer Services use zonal Network Endpoint Group (NEG) backends by default

## Feature In GKE version 1.32.2-gke.1652000 and later, new external LoadBalancer Services use zonal Network Endpoint Group (NEG) backends by default. This applies only to new backend service-based external LoadBalancer Services. Existing LoadBalancer Services are not affected. To learn more, see [Create a backend service-based external load balancer](https://cloud.google.com/kubernetes-engine/docs/how-to/backend-service-based-external-load-balancer). ## Feature All GKE clusters now export four new rollup metrics by default at no additional charge. These new metrics are for monitoring GKE TPU NodePools and JobSets: * `kubernetes.io/node_pool/accelerator/times_to_recover`: Distribution of recovery period durations. Each sample indicates a single recovery operation for the NodePool to recover from a downtime period. The data is sampled within 60s after the completion of NodePool recovery, and emitted within 24h. This metric does not include a sample for downtime period longer than 7 days. This metric is only applicable for GKE multi-host TPU node pools. * `kubernetes.io/jobset/times_between_interruptions`: Distribution of times between the end of last interruption and beginning of current interruption for a JobSet. Each sample indicates a single duration between last and current interruption. The data is sampled within 60s after the current interruption starts, and emitted within 24h. The metric does not include a sample for duration between interruptions longer than 7 days. This metric is only applicable for JobSets running on nodes with GPU/TPU and having a single replicated job. * `kubernetes.io/jobset/times_to_recover`: Distribution of recovery period durations. Each sample indicates a single recovery operation for the JobSet to recover from a downtime period. The data is sampled within 60s after the completion of JobSet recovery, and emitted within 24h. This metric does not include samples for downtime periods longer than 7 days. This metric is only applicable for JobSets running on nodes with GPU/TPU and having a single replicated job. * `kubernetes.io/jobset/uptime`: Total time the JobSet has been available. The data is sampled every 60s and emitted within 24h after sampling. This metric is only applicable for JobSets running on nodes with GPU/TPU and having a single replicated job. ## Feature Starting in GKE version 1.32.1-gke.1729000, Autopilot clusters will automatically use the new [Performance HPA Profile](https://cloud.google.com/kubernetes-engine/docs/how-to/horizontal-pod-autoscaling#hpa-profile). This new profile enables faster autoscaling on CPU and Memory metrics for up to 1,000 `HorizontalPodAutoscaler` objects by routing autoscaling metrics through the `gke-metrics-agent` Daemonset. If desired, users can revert to the old autoscaling profile by [disabling the Peformance HPA Profile](https://cloud.google.com/kubernetes-engine/docs/how-to/horizontal-pod-autoscaling#disable%5Fperformance%5Fhpa%5Fprofile).