Skip getting metrics from new nodes

node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/MetricsV2MetricsFetcher.java

@@ -17,6 +17,7 @@
 import org.apache.hc.core5.concurrent.FutureCallback;
 
 import java.io.IOException;
+import java.time.Duration;
 import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
 import java.util.logging.Level;
@@ -54,8 +55,11 @@ public CompletableFuture<MetricsResponse> fetchMetrics(ApplicationId application
         NodeList applicationNodes = nodeRepository.nodes().list().owner(application).state(Node.State.active);
 
         Optional<Node> metricsV2Container = applicationNodes.container()
-                                                            .matching(node -> expectedUp(node))
-                                                            .first();
+                .matching(this::expectedUp)
+                .stream()
+                .filter(node -> ! newNode(node)) // Skip newly added nodes, as they may not be reachable
+                .findFirst();
+
         if (metricsV2Container.isEmpty()) {
             return CompletableFuture.completedFuture(MetricsResponse.empty());
         }
@@ -67,6 +71,13 @@ public CompletableFuture<MetricsResponse> fetchMetrics(ApplicationId application
         }
     }
 
+    /**
+     * Returns true if this a new node (oldest node history event is less than 3 minutes old)
+     */
+    private boolean newNode(Node node) {
+        return node.history().age(nodeRepository.clock().instant()).compareTo(Duration.ofMinutes(3)) <= 0;
+    }
+
     @Override
     public void deconstruct() {
         httpClient.close();

node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/MetricsV2MetricsFetcherTest.java

@@ -13,6 +13,7 @@
 import com.yahoo.vespa.applicationmodel.HostName;
 import org.junit.Test;
 
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;
@@ -37,6 +38,7 @@ public void testMetricsFetch() throws Exception {
         MetricsV2MetricsFetcher fetcher = new MetricsV2MetricsFetcher(tester.nodeRepository(), orchestrator, httpClient);
 
         tester.makeReadyNodes(4, resources); // Creates (in order) host-1.yahoo.com, host-2.yahoo.com, host-3.yahoo.com, host-4.yahoo.com
+        tester.clock().advance(Duration.ofMinutes(5)); // Make sure these are not considered new nodes (metrics will not be fetched for them)
         tester.activateTenantHosts();
 
         ApplicationId application1 = ProvisioningTester.applicationId();

node-repository/src/test/java/com/yahoo/vespa/hosted/provision/maintenance/NodeMetricsDbMaintainerTest.java

@@ -34,6 +34,7 @@ public void testNodeMetricsDbMaintainer() {
         ProvisioningTester tester = new ProvisioningTester.Builder().build();
         tester.clock().setInstant(Instant.ofEpochMilli(1400));
         tester.makeReadyNodes(2, resources);
+        tester.advanceTime(Duration.ofMinutes(5)); // Make sure these are not considered new nodes (metrics will not be fetched for them)
         tester.activateTenantHosts();
         tester.deploy(ProvisioningTester.applicationId("test"),
                       Capacity.from(new ClusterResources(2, 1, resources)));