The  Alerts.alerts run the `func (a *Alerts) gc()`, at the same time, 
`aggrGroup.flush` is run.

Some alert is resolved, so in the Alerts.alerts callback could delete fp 
from `Marker`. But, `aggrGroup.flush` with inhibitor and silencer could 
enter `Marker.SetInhibited` or `Marker.SetSilenced`, and then the fp will 
always hold by Marker in the memory.

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