Subtract returns a new FetchFunc that subtracts 2 values.

APIServerQueries are the queries we will do to the control plane API Server in order to fetch all the raw metrics.

APIServerSpecs are the metric specifications we want to collect from the control plane API server.

CadvisorQueries are the queries we will do to the kubelet metrics cadvisor endpoint in order to fetch all the raw metrics.

ControllerManagerQueries are the queries we will do to the control plane controller manager in order to fetch all the raw metrics.

ControllerManagerSpecs are the metric specifications we want to collect from the control plane controller manager.

EtcdQueries are the queries we will do to the control plane etcd instances in order to fetch all the raw metrics.

EtcdSpecs are the metric specifications we want to collect from ETCD.

KSMQueries are the queries we will do to KSM in order to fetch all the raw metrics.

KSMSpecs are the metric specifications we want to collect from KSM.

KubeletSpecs are the metric specifications we want to collect from Kubelet.

SchedulerQueries are the queries we will do to the control plane scheduler in order to fetch all the raw metrics.

SchedulerSpecs are the metric specifications we want to collect from the control plane scheduler.