feat: Adding two new fields for Instance create_time and update_time

PiperOrigin-RevId: 458877561

google/spanner/admin/instance/v1/spanner_instance_admin.proto

@@ -1,4 +1,4 @@
-// Copyright 2021 Google LLC
+// Copyright 2022 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -179,7 +179,7 @@ service InstanceAdmin {
   // [Instance][google.spanner.admin.instance.v1.Instance], if successful.
   //
   // Authorization requires `spanner.instances.update` permission on
-  // resource [name][google.spanner.admin.instance.v1.Instance.name].
+  // the resource [name][google.spanner.admin.instance.v1.Instance.name].
   rpc UpdateInstance(UpdateInstanceRequest) returns (google.longrunning.Operation) {
     option (google.api.http) = {
       patch: "/v1/{instance.name=projects/*/instances/*}"
@@ -309,7 +309,7 @@ message InstanceConfig {
 
   // A unique identifier for the instance configuration.  Values
   // are of the form
-  // `projects/<project>/instanceConfigs/[a-z][-a-z0-9]*`
+  // `projects/<project>/instanceConfigs/[a-z][-a-z0-9]*`.
   string name = 1;
 
   // The name of this instance configuration as it appears in UIs.
@@ -319,7 +319,7 @@ message InstanceConfig {
   // replication properties.
   repeated ReplicaInfo replicas = 3;
 
-  // Allowed values of the “default_leader” schema option for databases in
+  // Allowed values of the "default_leader" schema option for databases in
   // instances that use this instance configuration.
   repeated string leader_options = 4;
 }
@@ -367,17 +367,23 @@ message Instance {
   // Must be unique per project and between 4 and 30 characters in length.
   string display_name = 3 [(google.api.field_behavior) = REQUIRED];
 
-  // Required. The number of nodes allocated to this instance. This may be zero
-  // in API responses for instances that are not yet in state `READY`.
+  // The number of nodes allocated to this instance. At most one of either
+  // node_count or processing_units should be present in the message. This
+  // may be zero in API responses for instances that are not yet in state
+  // `READY`.
   //
   // See [the
-  // documentation](https://cloud.google.com/spanner/docs/instances#node_count)
-  // for more information about nodes.
+  // documentation](https://cloud.google.com/spanner/docs/compute-capacity)
+  // for more information about nodes and processing units.
   int32 node_count = 5;
 
   // The number of processing units allocated to this instance. At most one of
   // processing_units or node_count should be present in the message. This may
   // be zero in API responses for instances that are not yet in state `READY`.
+  //
+  // See [the
+  // documentation](https://cloud.google.com/spanner/docs/compute-capacity)
+  // for more information about nodes and processing units.
   int32 processing_units = 9;
 
   // Output only. The current instance state. For
@@ -395,9 +401,9 @@ message Instance {
   // firewall, load balancing, etc.).
   //
   //  * Label keys must be between 1 and 63 characters long and must conform to
-  //    the following regular expression: `[a-z]([-a-z0-9]*[a-z0-9])?`.
+  //    the following regular expression: `[a-z][a-z0-9_-]{0,62}`.
   //  * Label values must be between 0 and 63 characters long and must conform
-  //    to the regular expression `([a-z]([-a-z0-9]*[a-z0-9])?)?`.
+  //    to the regular expression `[a-z0-9_-]{0,63}`.
   //  * No more than 64 labels can be associated with a given resource.
   //
   // See https://goo.gl/xmQnxf for more information on and examples of labels.
@@ -412,6 +418,12 @@ message Instance {
 
   // Deprecated. This field is not populated.
   repeated string endpoint_uris = 8;
+
+  // Output only. The time at which the instance was created.
+  google.protobuf.Timestamp create_time = 11 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Output only. The time at which the instance was most recently updated.
+  google.protobuf.Timestamp update_time = 12 [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
 // The request for [ListInstanceConfigs][google.spanner.admin.instance.v1.InstanceAdmin.ListInstanceConfigs].