lownodeutilization: evictionLimits to limit the evictions per plugin

In some cases it might be usefull to limit how many evictions per a
domain can be performed. To avoid burning the whole per descheduling
cycle budget. Limiting the number of evictions per node is a
prerequisite for evicting pods whose usage can't be easily subtracted
from overall node resource usage to predict the final usage. E.g. when a
pod is evicted due to high PSI pressure which takes into account many
factors which can be fully captured by the current predictive resource
model.

pkg/api/types.go

@@ -64,6 +64,12 @@ type Namespaces struct {
 	Exclude []string `json:"exclude,omitempty"`
 }
 
+// EvictionLimits limits the number of evictions per domain. E.g. node, namespace, total.
+type EvictionLimits struct {
+	// node restricts the maximum number of evictions per node
+	Node *uint `json:"node,omitempty"`
+}
+
 type (
 	Percentage         float64
 	ResourceThresholds map[v1.ResourceName]Percentage