chore: import upstream snapshot with attribution

kubernetes/internal/controller/algorithm/interface.go

@@ -0,0 +1,40 @@
+// Copyright 2025 Alibaba Group Holding Ltd.
+//
+// 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 algorithm
+
+// Algorithm determines how available pods are distributed among sandbox requests.
+type Algorithm interface {
+	// Schedule distributes available pods among sandbox requests and returns the allocation action.
+	Schedule(availablePods []string, allRequest []*SandboxRequest) *AllocAction
+}
+
+// SandboxRequest describes a sandbox's allocation need.
+type SandboxRequest struct {
+	SandboxName   string
+	CurAllocation []string
+	CurReleased   []string
+	PodSupplement int32
+	ToRelease     []string
+}
+
+// AllocAction represents the result of a scheduling decision.
+type AllocAction struct {
+	// allocate pods to sandbox (sandbox -> pods)
+	ToAllocate map[string][]string
+	// release pods from sandbox (sandbox -> pods)
+	ToRelease map[string][]string
+	// pod request count
+	PodSupplement int32
+}