[WIP]feat: Add UserAnnotedExpiration as a new disruption method

pkg/controllers/disruption/custom_expiration.go

@@ -0,0 +1,74 @@
+/*
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package disruption
+
+import (
+	"context"
+
+	"k8s.io/utils/clock"
+
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	"github.com/aws/karpenter-core/pkg/controllers/provisioning"
+	"github.com/aws/karpenter-core/pkg/controllers/state"
+	"github.com/aws/karpenter-core/pkg/events"
+	"github.com/aws/karpenter-core/pkg/metrics"
+)
+
+// UserAnnotedExpiration is a subreconciler that deletes custom marked candidates, based on node annotations.
+// Expiration will respect TTLSecondsAfterEmpty
+type UserAnnotedExpiration struct {
+	clock       clock.Clock
+	kubeClient  client.Client
+	cluster     *state.Cluster
+	provisioner *provisioning.Provisioner
+	recorder    events.Recorder
+}
+
+func NewCustomExpiration(clk clock.Clock, kubeClient client.Client, cluster *state.Cluster, provisioner *provisioning.Provisioner, recorder events.Recorder) *Expiration {
+	return &Expiration{
+		clock:       clk,
+		kubeClient:  kubeClient,
+		cluster:     cluster,
+		provisioner: provisioner,
+		recorder:    recorder,
+	}
+}
+
+// ShouldDisrupt is a predicate used to filter candidates
+func (e *UserAnnotedExpiration) ShouldDisrupt(_ context.Context, c *Candidate) bool {
+	// TODO: tasdikrahman to implement this.
+	return true
+}
+
+// SortCandidates orders expired candidates by when they've expired
+func (e *UserAnnotedExpiration) filterAndSortCandidates(ctx context.Context, candidates []*Candidate) ([]*Candidate, error) {
+	// TODO: tasdikrahman to implement this.
+	return candidates, nil
+}
+
+// ComputeCommand generates a disrpution command given candidates
+func (e *UserAnnotedExpiration) ComputeCommand(ctx context.Context, candidates ...*Candidate) (Command, error) {
+	// TODO: tasdikrahman to implement this.
+	return Command{}, nil
+}
+
+func (e *UserAnnotedExpiration) Type() string {
+	return metrics.UserAnnotedExpiration
+}
+
+func (e *UserAnnotedExpiration) ConsolidationType() string {
+	return ""
+}

pkg/metrics/constants.go

@@ -30,11 +30,12 @@ const (
 	TypeLabel        = "type"
 
 	// Reasons for CREATE/DELETE shared metrics
-	ConsolidationReason = "consolidation"
-	ProvisioningReason  = "provisioning"
-	ExpirationReason    = "expiration"
-	EmptinessReason     = "emptiness"
-	DriftReason         = "drift"
+	ConsolidationReason   = "consolidation"
+	ProvisioningReason    = "provisioning"
+	ExpirationReason      = "expiration"
+	UserAnnotedExpiration = "user-annotated-expiration"
+	EmptinessReason       = "emptiness"
+	DriftReason           = "drift"
 )
 
 // DurationBuckets returns a []float64 of default threshold values for duration histograms.