Add wireguard key timestamp to node repo and WireguardPeer

- Set from NodePatcher clock.
- Add UNINITIALIZED wireguard key constant

7 files changed, 89 insertions, 34 deletions

diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/Node.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/Node.java
index 864566f119e..8db8e7c2cf8 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/Node.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/Node.java
@@ -65,6 +65,7 @@ public final class Node implements Nodelike {
 
     /** Only set for configservers and exclave nodes */
     private final Optional<WireguardKey> wireguardPubKey;
+    private final Optional<Instant> wireguardKeyTimestamp;
 
     /** Record of the last event of each type happening to this node */
     private final History history;
@@ -95,7 +96,8 @@ public final class Node implements Nodelike {
                 NodeType type, Reports reports, Optional<String> modelName, Optional<TenantName> reservedTo,
                 Optional<ApplicationId> exclusiveToApplicationId, Optional<Duration> hostTTL, Optional<Instant> hostEmptyAt,
                 Optional<ClusterSpec.Type> exclusiveToClusterType, Optional<String> switchHostname,
-                List<TrustStoreItem> trustStoreItems, CloudAccount cloudAccount, Optional<WireguardKey> wireguardPubKey) {
+                List<TrustStoreItem> trustStoreItems, CloudAccount cloudAccount, Optional<WireguardKey> wireguardPubKey,
+                Optional<Instant> wireguardKeyTimestamp) {
         this.id = Objects.requireNonNull(id, "A node must have an ID");
         this.extraId = Objects.requireNonNull(extraId, "Extra ID cannot be null");
         this.hostname = requireNonEmptyString(hostname, "A node must have a hostname");
@@ -118,6 +120,7 @@ public final class Node implements Nodelike {
         this.trustStoreItems = Objects.requireNonNull(trustStoreItems).stream().distinct().toList();
         this.cloudAccount = Objects.requireNonNull(cloudAccount);
         this.wireguardPubKey = Objects.requireNonNull(wireguardPubKey);
+        this.wireguardKeyTimestamp = Objects.requireNonNull(wireguardKeyTimestamp);
 
         if (state == State.active)
             requireNonEmpty(ipConfig.primary(), "Active node " + hostname + " must have at least one valid IP address");
@@ -265,6 +268,11 @@ public final class Node implements Nodelike {
         return wireguardPubKey;
     }
 
+    /** Returns the timestamp of the wireguard key of this node. Only relevant for enclave nodes. */
+    public Optional<Instant> wireguardKeyTimestamp() {
+        return wireguardKeyTimestamp;
+    }
+
     /**
      * Returns a copy of this where wantToFail is set to true and history is updated to reflect this.
      */
@@ -359,14 +367,16 @@ public final class Node implements Nodelike {
     public Node with(Status status) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history, type,
                         reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a node with the type assigned to the given value */
     public Node with(NodeType type) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history, type,
                         reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a node with the flavor assigned to the given value */
@@ -375,35 +385,40 @@ public final class Node implements Nodelike {
         History updateHistory = history.with(new History.Event(History.Event.Type.resized, agent, instant));
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, updateHistory, type,
                         reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this with the reboot generation set to generation */
     public Node withReboot(Generation generation) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status.withReboot(generation), state, allocation,
                         history, type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this with given id set */
     public Node withId(String id) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation,
                         history, type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this with model name set to given value */
     public Node withModelName(String modelName) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, Optional.of(modelName), reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this with model name cleared */
     public Node withoutModelName() {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, Optional.empty(), reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this with a history record saying it was detected to be down at this instant */
@@ -445,21 +460,24 @@ public final class Node implements Nodelike {
     public Node with(Allocation allocation) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, Optional.of(allocation), history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this node with IP config set to the given value. */
     public Node with(IP.Config ipConfig) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this node with the parent hostname assigned to the given value. */
     public Node withParentHostname(String parentHostname) {
         return new Node(id, extraId, ipConfig, hostname, Optional.of(parentHostname), flavor, status, state, allocation,
                         history, type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node withReservedTo(TenantName tenant) {
@@ -467,57 +485,73 @@ public final class Node implements Nodelike {
             throw new IllegalArgumentException("Only host nodes can be reserved, " + hostname + " has type " + type);
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, Optional.of(tenant), exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this node which is not reserved to a tenant */
     public Node withoutReservedTo() {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, Optional.empty(), exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node withExclusiveToApplicationId(ApplicationId exclusiveTo) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, Optional.ofNullable(exclusiveTo), hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node withExtraId(Optional<String> extraId) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node withHostTTL(Duration hostTTL) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, Optional.ofNullable(hostTTL), hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node withHostEmptyAt(Instant hostEmptyAt) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, Optional.ofNullable(hostEmptyAt),
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node withExclusiveToClusterType(ClusterSpec.Type exclusiveTo) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        Optional.ofNullable(exclusiveTo), switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        Optional.ofNullable(exclusiveTo), switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node withWireguardPubkey(WireguardKey wireguardPubkey) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, Optional.ofNullable(wireguardPubkey));
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, Optional.ofNullable(wireguardPubkey),
+                        wireguardKeyTimestamp);
+    }
+
+    public Node withWireguardKeyTimestamp(Instant wireguardKeyTimestamp) {
+        return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
+                type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
+                exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                Optional.ofNullable(wireguardKeyTimestamp));
     }
 
     /** Returns a copy of this node with switch hostname set to given value */
     public Node withSwitchHostname(String switchHostname) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, Optional.ofNullable(switchHostname), trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, Optional.ofNullable(switchHostname), trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     /** Returns a copy of this node with switch hostname unset */
@@ -570,19 +604,22 @@ public final class Node implements Nodelike {
     public Node with(History history) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node with(Reports reports) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     public Node with(List<TrustStoreItem> trustStoreItems) {
         return new Node(id, extraId, ipConfig, hostname, parentHostname, flavor, status, state, allocation, history,
                         type, reports, modelName, reservedTo, exclusiveToApplicationId, hostTTL, hostEmptyAt,
-                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey);
+                        exclusiveToClusterType, switchHostname, trustStoreItems, cloudAccount, wireguardPubKey,
+                        wireguardKeyTimestamp);
     }
 
     private static Optional<String> requireNonEmptyString(Optional<String> value, String message) {
@@ -731,6 +768,7 @@ public final class Node implements Nodelike {
         private List<TrustStoreItem> trustStoreItems;
         private CloudAccount cloudAccount = CloudAccount.empty;
         private WireguardKey wireguardPubKey;
+        private Instant wireguardKeyTimestamp;
 
         private Builder(String id, String hostname, Flavor flavor, State state, NodeType type) {
             this.id = id;
@@ -825,6 +863,11 @@ public final class Node implements Nodelike {
             return this;
         }
 
+        public Builder wireguardKeyTimestamp(Instant wireguardKeyTimestamp) {
+            this.wireguardKeyTimestamp = wireguardKeyTimestamp;
+            return this;
+        }
+
         public Node build() {
             return new Node(id, Optional.empty(), Optional.ofNullable(ipConfig).orElse(IP.Config.EMPTY), hostname, Optional.ofNullable(parentHostname),
                             flavor, Optional.ofNullable(status).orElseGet(Status::initial), state, Optional.ofNullable(allocation),
@@ -832,7 +875,7 @@ public final class Node implements Nodelike {
                             Optional.ofNullable(modelName), Optional.ofNullable(reservedTo), Optional.ofNullable(exclusiveToApplicationId),
                             Optional.ofNullable(hostTTL), Optional.ofNullable(hostEmptyAt), Optional.ofNullable(exclusiveToClusterType),
                             Optional.ofNullable(switchHostname), Optional.ofNullable(trustStoreItems).orElseGet(List::of), cloudAccount,
-                            Optional.ofNullable(wireguardPubKey));
+                            Optional.ofNullable(wireguardPubKey), Optional.ofNullable(wireguardKeyTimestamp));
         }
 
     }
diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/CuratorDb.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/CuratorDb.java
index 43a135a7e04..3c3868bfeb8 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/CuratorDb.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/CuratorDb.java
@@ -4,7 +4,6 @@ package com.yahoo.vespa.hosted.provision.persistence;
 import ai.vespa.http.DomainName;
 import com.google.common.cache.Cache;
 import com.google.common.cache.CacheBuilder;
-import com.google.common.util.concurrent.UncheckedExecutionException;
 import com.yahoo.collections.Pair;
 import com.yahoo.component.Version;
 import com.yahoo.concurrent.UncheckedTimeoutException;
@@ -42,7 +41,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.TreeMap;
-import java.util.concurrent.ExecutionException;
 import java.util.function.Function;
 import java.util.function.Predicate;
 import java.util.logging.Level;
@@ -222,8 +220,9 @@ public class CuratorDb {
                                     toState.isAllocated() ? node.allocation() : Optional.empty(),
                                     node.history().recordStateTransition(node.state(), toState, agent, clock.instant()),
                                     node.type(), node.reports(), node.modelName(), node.reservedTo(),
-                                    node.exclusiveToApplicationId(), node.hostTTL(), node.hostEmptyAt(), node.exclusiveToClusterType(),
-                                    node.switchHostname(), node.trustedCertificates(), node.cloudAccount(), node.wireguardPubKey());
+                                    node.exclusiveToApplicationId(), node.hostTTL(), node.hostEmptyAt(),
+                                    node.exclusiveToClusterType(), node.switchHostname(), node.trustedCertificates(),
+                                    node.cloudAccount(), node.wireguardPubKey(), node.wireguardKeyTimestamp());
             curatorTransaction.add(createOrSet(nodePath(newNode), nodeSerializer.toJson(newNode)));
             writtenNodes.add(newNode);
         }
diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/NodeSerializer.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/NodeSerializer.java
index df39a0230b6..358c94895d1 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/NodeSerializer.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/NodeSerializer.java
@@ -100,6 +100,7 @@ public class NodeSerializer {
     private static final String trustedCertificatesKey = "trustedCertificates";
     private static final String cloudAccountKey = "cloudAccount";
     private static final String wireguardPubKeyKey = "wireguardPubkey";
+    private static final String wireguardKeyTimestampKey = "wireguardKeyTimestamp";
 
     // Node resource fields
     private static final String flavorKey = "flavor";
@@ -190,6 +191,7 @@ public class NodeSerializer {
             object.setString(cloudAccountKey, node.cloudAccount().value());
         }
         node.wireguardPubKey().ifPresent(pubKey -> object.setString(wireguardPubKeyKey, pubKey.value()));
+        node.wireguardKeyTimestamp().ifPresent(timestamp -> object.setLong(wireguardKeyTimestampKey, timestamp.toEpochMilli()));
     }
 
     private void toSlime(Flavor flavor, Cursor object) {
@@ -284,7 +286,8 @@ public class NodeSerializer {
                         SlimeUtils.optionalString(object.field(switchHostnameKey)),
                         trustedCertificatesFromSlime(object),
                         SlimeUtils.optionalString(object.field(cloudAccountKey)).map(CloudAccount::from).orElse(CloudAccount.empty),
-                        SlimeUtils.optionalString(object.field(wireguardPubKeyKey)).map(WireguardKey::from));
+                        SlimeUtils.optionalString(object.field(wireguardPubKeyKey)).map(WireguardKey::from),
+                        SlimeUtils.optionalInstant(object.field(wireguardKeyTimestampKey)));
     }
 
     private Status statusFromSlime(Inspector object) {
diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/NodePatcher.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/NodePatcher.java
index d88cade0022..5915f02ec4f 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/NodePatcher.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/NodePatcher.java
@@ -273,8 +273,9 @@ public class NodePatcher {
             case "trustStore":
                 return nodeWithTrustStore(node, value);
             case "wireguardPubkey":
-                return node.withWireguardPubkey(SlimeUtils.optionalString(value).map(WireguardKey::new).orElse(null));
-            default :
+                return node.withWireguardPubkey(SlimeUtils.optionalString(value).map(WireguardKey::new).orElse(null))
+                        .withWireguardKeyTimestamp(clock.instant());
+            default:
                 throw new IllegalArgumentException("Could not apply field '" + name + "' on a node: No such modifiable field");
         }
     }
diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/NodesResponse.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/NodesResponse.java
index 5221fa8875b..e3960cc5db5 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/NodesResponse.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/NodesResponse.java
@@ -193,6 +193,7 @@ class NodesResponse extends SlimeJsonResponse {
             object.setString("cloudAccount", node.cloudAccount().value());
         }
         node.wireguardPubKey().ifPresent(key -> object.setString("wireguardPubkey", key.value()));
+        node.wireguardKeyTimestamp().ifPresent(timestamp -> object.setLong("wireguardKeyTimestamp", timestamp.toEpochMilli()));
     }
 
     private Version resolveVersionFlag(StringFlag flag, Node node, Allocation allocation) {
diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/WireguardResponse.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/WireguardResponse.java
index 76c709da97f..db61540cd0e 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/WireguardResponse.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/restapi/WireguardResponse.java
@@ -10,7 +10,9 @@ import com.yahoo.vespa.hosted.provision.NodeRepository;
 import com.yahoo.vespa.hosted.provision.node.IP;
 
 import java.net.InetAddress;
+import java.time.Instant;
 import java.util.List;
+import java.util.Optional;
 
 /**
  * A response containing the wireguard peer config for each configserver that has a public key.
@@ -34,13 +36,16 @@ public class WireguardResponse extends SlimeJsonResponse {
                     .toList();
             if (ipAddresses.isEmpty()) return;
 
-            addConfigserver(cfgArray.addObject(), cfg.hostname(), cfg.wireguardPubKey().get(), ipAddresses);
+            addConfigserver(cfgArray.addObject(), cfg.hostname(), cfg.wireguardPubKey().get(),
+                            cfg.wireguardKeyTimestamp(), ipAddresses);
         }
     }
 
-    private void addConfigserver(Cursor cfgEntry, String hostname, WireguardKey key, List<String> ipAddresses) {
+    private void addConfigserver(Cursor cfgEntry, String hostname, WireguardKey key, Optional<Instant> keyTimestamp,
+                                 List<String> ipAddresses) {
         cfgEntry.setString("hostname", hostname);
         cfgEntry.setString("wireguardPubkey", key.value());
+        cfgEntry.setLong("wireguardKeyTimestamp", keyTimestamp.orElse(Instant.EPOCH).toEpochMilli());
         NodesResponse.ipAddressesToSlime(ipAddresses, cfgEntry.setArray("ipAddresses"));
     }
 
diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNodeRepository.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNodeRepository.java
index 90cf37aa876..086639d7276 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNodeRepository.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNodeRepository.java
@@ -163,6 +163,7 @@ public class MockNodeRepository extends NodeRepository {
         nodes.add(Node.create("dockerhost2", ipConfig(101, 1, 3), "dockerhost2.yahoo.com",
                               flavors.getFlavorOrThrow("large"), NodeType.host)
                           .wireguardPubKey(WireguardKey.from("000011112222333344445555666677778888999900c="))
+                          .wireguardKeyTimestamp(Instant.ofEpochMilli(123L))
                           .cloudAccount(tenantAccount).build());
         nodes.add(Node.create("dockerhost3", ipConfig(102, 1, 3), "dockerhost3.yahoo.com",
                              flavors.getFlavorOrThrow("large"), NodeType.host).cloudAccount(defaultCloudAccount).build());
@@ -176,7 +177,9 @@ public class MockNodeRepository extends NodeRepository {
         // Config servers
         nodes.add(Node.create("cfg1", ipConfig(201), "cfg1.yahoo.com", flavors.getFlavorOrThrow("default"), NodeType.config)
                       .cloudAccount(defaultCloudAccount)
-                      .wireguardPubKey(WireguardKey.from("lololololololololololololololololololololoo=")).build());
+                      .wireguardPubKey(WireguardKey.from("lololololololololololololololololololololoo="))
+                      .wireguardKeyTimestamp(Instant.ofEpochMilli(456L))
+                      .build());
         nodes.add(Node.create("cfg2", ipConfig(202), "cfg2.yahoo.com", flavors.getFlavorOrThrow("default"), NodeType.config)
                       .cloudAccount(defaultCloudAccount)
                       .build());