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ExternalMetric -> DeploymentReplicaCount
Scale a deployment from zero to one replica when external event metrics exceed zero, allowing standard horizontal autoscalers to resume management.
Problem it solves
Standard autoscalers cannot scale down to or up from zero replicas because metrics collection typically requires active pods.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.