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

pkg/api/zz_generated.deepcopy.go

@@ -112,6 +112,27 @@ func (in *DeschedulerProfile) DeepCopy() *DeschedulerProfile {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *EvictionLimits) DeepCopyInto(out *EvictionLimits) {
+	*out = *in
+	if in.Node != nil {
+		in, out := &in.Node, &out.Node
+		*out = new(uint)
+		**out = **in
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new EvictionLimits.
+func (in *EvictionLimits) DeepCopy() *EvictionLimits {
+	if in == nil {
+		return nil
+	}
+	out := new(EvictionLimits)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *MetricsCollector) DeepCopyInto(out *MetricsCollector) {
 	*out = *in