[BUG] prometheus data aggregation

[zhouxiny1]

Chart data to be processed: Multiple occurrences of the same pod object are returned, with overlapping time points.

query:
rate(k8s_pod_cpu_time_seconds_total{node=".+",app_kubernetes_io_instance="$clusterName",k8s_pod_name=~"$pod",job="$job"}[$interval])

conditions：
Easy to reproduce >24hours
start: 1693451292
end: 1693537692
step: 15m0s