这个问题其实并不是repeat_interval真的没生效，而是告警没有重复，人家发的是新的告警，没有命中repeat_interval规则。
举个栗子
- alert: HighCpuLoad
expr: 100-(avg(irate(node_cpu_seconds_total{mode="idle"}[5m])) by(instance)* 100) > 70
for: 1m
labels:
severity: warning
annotations:
summary: "Host high CPU load (instance {{ $labels.instance }})"
description: "CPU load is > 80% VALUE = {{ $value }} LABELS = {{ $labels }}"
标签：load,alertmanager,labels,interval,instance,repeat,CPU From： https://www.cnblogs.com/ggborn-001/p/18160606