// Copyright 2026 The TensorFlow Authors. All Rights Reserved.
//
// 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.
// ==============================================================================

syntax = "proto3";

package tensorflow;

option cc_enable_arenas = true;

// Protocol buffer representing the checkpoint state.
message CheckpointState {
  // Path to the most-recent model checkpoint.
  string model_checkpoint_path = 1;

  // Paths to all not-yet-deleted model checkpoints, sorted from oldest to
  // newest.
  // Note that the value of model_checkpoint_path should be the last item in
  // this list.
  repeated string all_model_checkpoint_paths = 2;
  // Unix timestamps corresponding to all_model_checkpoint_paths, indicating
  // when each checkpoint was created.
  repeated double all_model_checkpoint_timestamps = 3;
  // Unix timestamp indicating the creation time for the last preserved
  // checkpoint.
  double last_preserved_timestamp = 4;
}