feat: [optimization] added support for walking mode and cost_per_kilometer_below_soft_max (googleapis#4620)

* feat: added support for walking mode and cost_per_kilometer_below_soft_max

Clients can now use walking as the travel mode. And clients can set a cost per kilometer bounded by the soft max.

PiperOrigin-RevId: 563199524

Source-Link: googleapis/googleapis@7578999

Source-Link: https://github.com/googleapis/googleapis-gen/commit/ba24bb374d50f1333eba36cf29988a054ba4ffff
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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packages/google-cloud-optimization/protos/google/cloud/optimization/v1/async_model.proto

@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

packages/google-cloud-optimization/protos/google/cloud/optimization/v1/fleet_routing.proto

@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -122,12 +122,20 @@ message OptimizeToursRequest {
     VALIDATE_ONLY = 1;
 
     // Only populates
+    // [OptimizeToursResponse.validation_errors][google.cloud.optimization.v1.OptimizeToursResponse.validation_errors]
+    // or
     // [OptimizeToursResponse.skipped_shipments][google.cloud.optimization.v1.OptimizeToursResponse.skipped_shipments],
     // and doesn't actually solve the rest of the request (`status` and `routes`
     // are unset in the response).
+    // If infeasibilities in `injected_solution_constraint` routes are detected
+    // they are populated in the
+    // [OptimizeToursResponse.validation_errors][google.cloud.optimization.v1.OptimizeToursResponse.validation_errors]
+    // field and
+    // [OptimizeToursResponse.skipped_shipments][google.cloud.optimization.v1.OptimizeToursResponse.skipped_shipments]
+    // is left empty.
     //
     // *IMPORTANT*: not all infeasible shipments are returned here, but only the
-    // ones that are detected as infeasible as a preprocessing.
+    // ones that are detected as infeasible during preprocessing.
     DETECT_SOME_INFEASIBLE_SHIPMENTS = 2;
   }
 
@@ -165,15 +173,6 @@ message OptimizeToursRequest {
   // By default, the solving mode is `DEFAULT_SOLVE` (0).
   SolvingMode solving_mode = 4;
 
-  // Truncates the number of validation errors returned. These errors are
-  // typically attached to an INVALID_ARGUMENT error payload as a BadRequest
-  // error detail (https://cloud.google.com/apis/design/errors#error_details),
-  // unless solving_mode=VALIDATE_ONLY: see the
-  // [OptimizeToursResponse.validation_errors][google.cloud.optimization.v1.OptimizeToursResponse.validation_errors]
-  // field.
-  // This defaults to 100 and is capped at 10,000.
-  optional int32 max_validation_errors = 5;
-
   // Search mode used to solve the request.
   SearchMode search_mode = 6;
 
@@ -339,6 +338,15 @@ message OptimizeToursRequest {
   // meters/seconds.
   optional double geodesic_meters_per_second = 16;
 
+  // Truncates the number of validation errors returned. These errors are
+  // typically attached to an INVALID_ARGUMENT error payload as a BadRequest
+  // error detail (https://cloud.google.com/apis/design/errors#error_details),
+  // unless solving_mode=VALIDATE_ONLY: see the
+  // [OptimizeToursResponse.validation_errors][google.cloud.optimization.v1.OptimizeToursResponse.validation_errors]
+  // field.
+  // This defaults to 100 and is capped at 10,000.
+  optional int32 max_validation_errors = 5;
+
   // Label that may be used to identify this request, reported back in the
   // [OptimizeToursResponse.request_label][google.cloud.optimization.v1.OptimizeToursResponse.request_label].
   string label = 17;
@@ -1131,6 +1139,9 @@ message Vehicle {
 
     // Travel mode corresponding to driving directions (car, ...).
     DRIVING = 1;
+
+    // Travel mode corresponding to walking directions.
+    WALKING = 2;
   }
 
   // Policy on how a vehicle can be unloaded. Applies only to shipments having
@@ -1565,6 +1576,15 @@ message DistanceLimit {
   // nonnegative.
   optional int64 soft_max_meters = 2;
 
+  // Cost per kilometer incurred, increasing up to `soft_max_meters`, with
+  // formula:
+  // ```
+  //   min(distance_meters, soft_max_meters) / 1000.0 *
+  //   cost_per_kilometer_below_soft_max.
+  // ```
+  // This cost is not supported in `route_distance_limit`.
+  optional double cost_per_kilometer_below_soft_max = 4;
+
   // Cost per kilometer incurred if distance is above `soft_max_meters` limit.
   // The additional cost is 0 if the distance is under the limit, otherwise the
   // formula used to compute the cost is the following:
@@ -2395,7 +2415,8 @@ message InjectedSolutionConstraint {
         RELAX_VISIT_TIMES_AFTER_THRESHOLD = 1;
 
         // Same as `RELAX_VISIT_TIMES_AFTER_THRESHOLD`, but the visit sequence
-        // is also relaxed: visits remain simply bound to their vehicle.
+        // is also relaxed: visits can only be performed by this vehicle, but
+        // can potentially become unperformed.
         RELAX_VISIT_TIMES_AND_SEQUENCE_AFTER_THRESHOLD = 2;
 
         // Same as `RELAX_VISIT_TIMES_AND_SEQUENCE_AFTER_THRESHOLD`, but the
@@ -2533,6 +2554,7 @@ message OptimizeToursValidationError {
   //     * INJECTED_SOLUTION_CONCURRENT_SOLUTION_TYPES = 2005;
   //     * INJECTED_SOLUTION_MORE_THAN_ONE_PER_TYPE = 2006;
   //     * INJECTED_SOLUTION_REFRESH_WITHOUT_POPULATE = 2008;
+  //     * INJECTED_SOLUTION_CONSTRAINED_ROUTE_PORTION_INFEASIBLE = 2010;
   // * SHIPMENT_MODEL_ERROR = 22;
   //     * SHIPMENT_MODEL_TOO_LARGE = 2200;
   //     * SHIPMENT_MODEL_TOO_MANY_CAPACITY_TYPES = 2201;