ObjectMetricSource indicates how to scale on a metric describing a kubernetes object (for example, hits-per-second on an Ingress object).
describedObject specifies the descriptions of a object,such as kind,name apiVersion
metric identifies the target metric by name and selector
target specifies the target value for the given metric
ObjectMetricSource indicates how to scale on a metric describing a kubernetes object (for example, hits-per-second on an Ingress object).