promethues恢复告警，但是值还是大于设置的阈值？

Question

1，prometheus告警语法，设置的的是大于8000，持续时间5min中告警

告警语法：

- alert: HostContextSwitching
  expr: (rate(node_context_switches_total[5m])) / (count without(cpu, mode) (node_cpu_seconds_total{mode="idle"})) > 8000
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: Host context switching (instance {{ $labels.instance }})
    description: "上下文切换次数  (> 8000 / s)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

2，正常告警出来，如图

但是恢复提示的值竟然还是大于8000