Can a Ceilometer client create an alarm with a grace period? That is, an
initial period of time during which alarms are suppressed. For a related
concept, see the grace period in an AWS autoscaling group. Note that in
an OpenStack heat template, the author can not write an arithmetic
expression --- any time written must be a literal (and thus apply equally
to all members of a scaling group, regardless of when they were created).
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