Separate loading methods

4 files changed, 254 insertions, 324 deletions

diff --git a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/AutoscalingTest.java b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/AutoscalingTest.java
index d9198452b23..e6873e7118f 100644
--- a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/AutoscalingTest.java
+++ b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/AutoscalingTest.java
@@ -39,11 +39,11 @@ public class AutoscalingTest {
         fixture.tester().clock().advance(Duration.ofDays(1));
         assertTrue("No measurements -> No change", fixture.autoscale().isEmpty());
 
-        fixture.applyCpuLoad(0.7f, 59);
+        fixture.loader().applyCpuLoad(0.7f, 59);
         assertTrue("Too few measurements -> No change", fixture.autoscale().isEmpty());
 
         fixture.tester().clock().advance(Duration.ofDays(1));
-        fixture.applyCpuLoad(0.7f, 120);
+        fixture.loader().applyCpuLoad(0.7f, 120);
         ClusterResources scaledResources = fixture.tester().assertResources("Scaling up since resource usage is too high",
                                                                             9, 1, 2.8,  5.0, 50.0,
                                                                             fixture.autoscale());
@@ -54,14 +54,14 @@ public class AutoscalingTest {
         fixture.deactivateRetired(Capacity.from(scaledResources));
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyCpuLoad(0.8f, 3);
+        fixture.loader().applyCpuLoad(0.8f, 3);
         assertTrue("Load change is large, but insufficient measurements for new config -> No change",
                    fixture.autoscale().isEmpty());
 
-        fixture.applyCpuLoad(0.19f, 100);
+        fixture.loader().applyCpuLoad(0.19f, 100);
         assertEquals("Load change is small -> No change", Optional.empty(), fixture.autoscale().target());
 
-        fixture.applyCpuLoad(0.1f, 120);
+        fixture.loader().applyCpuLoad(0.1f, 120);
         fixture.tester().assertResources("Scaling cpu down since usage has gone down significantly",
                                          9, 1, 1.0, 5.0, 50.0,
                                          fixture.autoscale());
@@ -72,7 +72,7 @@ public class AutoscalingTest {
     public void test_autoscaling_up_is_fast_TODO() {
         var fixture = AutoscalingTester.fixture().build();
         fixture.tester().clock().advance(Duration.ofDays(1)); // TODO: Remove the need for this
-        fixture.applyLoad(1.0, 1.0, 1.0, 120); // TODO: Make this low
+        fixture.loader().applyLoad(1.0, 1.0, 1.0, 120); // TODO: Make this low
         fixture.tester().assertResources("Scaling up since resource usage is too high",
                                          10, 1, 9.4, 8.5, 92.6,
                                          fixture.autoscale());
@@ -82,12 +82,12 @@ public class AutoscalingTest {
     @Test
     public void test_autoscaling_single_container_group() {
         var fixture = AutoscalingTester.fixture().clusterType(ClusterSpec.Type.container).build();
-        fixture.applyCpuLoad(0.25f, 120);
+        fixture.loader().applyCpuLoad(0.25f, 120);
         ClusterResources scaledResources = fixture.tester().assertResources("Scaling up since cpu usage is too high",
                                                                   5, 1, 3.8,  8.0, 50.5,
                                                                   fixture.autoscale());
         fixture.deploy(Capacity.from(scaledResources));
-        fixture.applyCpuLoad(0.1f, 120);
+        fixture.loader().applyCpuLoad(0.1f, 120);
         fixture.tester().assertResources("Scaling down since cpu usage has gone down",
                                          4, 1, 2.5, 6.4, 25.5,
                                          fixture.autoscale());
@@ -102,11 +102,11 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(new ClusterResources(5, 1, resources)))
                                        .build();
 
-        assertTrue(fixture.tester().nodeRepository().nodes().list().owner(fixture.application).stream()
-                         .allMatch(n -> n.allocation().get().requestedResources().diskSpeed() == slow));
+        assertTrue(fixture.tester().nodeRepository().nodes().list().owner(fixture.applicationId).stream()
+                          .allMatch(n -> n.allocation().get().requestedResources().diskSpeed() == slow));
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyCpuLoad(0.25, 120);
+        fixture.loader().applyCpuLoad(0.25, 120);
 
         // Changing min and max from slow to any
         ClusterResources min = new ClusterResources( 2, 1,
@@ -135,14 +135,14 @@ public class AutoscalingTest {
                                        .build();
 
         // Redeployment without target: Uses current resource numbers with *requested* non-numbers (i.e disk-speed any)
-        assertTrue(fixture.tester().nodeRepository().applications().get(fixture.application).get().cluster(fixture.cluster.id()).get().targetResources().isEmpty());
+        assertTrue(fixture.tester().nodeRepository().applications().get(fixture.applicationId).get().cluster(fixture.clusterSpec.id()).get().targetResources().isEmpty());
         fixture.deploy();
         assertEquals(DiskSpeed.any, fixture.nodes().first().get().allocation().get().requestedResources().diskSpeed());
 
         // Autoscaling: Uses disk-speed any as well
         fixture.deactivateRetired(capacity);
         fixture.tester().clock().advance(Duration.ofDays(1));
-        fixture.applyCpuLoad(0.8, 120);
+        fixture.loader().applyCpuLoad(0.8, 120);
         assertEquals(DiskSpeed.any, fixture.autoscale(capacity).target().get().nodeResources().diskSpeed());
     }
 
@@ -156,7 +156,7 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(min, max)).build();
 
         fixture.tester().clock().advance(Duration.ofDays(1));
-        fixture.applyLoad(0.25, 0.95, 0.95, 120);
+        fixture.loader().applyLoad(0.25, 0.95, 0.95, 120);
         fixture.tester().assertResources("Scaling up to limit since resource usage is too high",
                                          6, 1, 2.4,  78.0, 79.0,
                                          fixture.autoscale());
@@ -170,7 +170,7 @@ public class AutoscalingTest {
 
         // deploy
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(0.05f, 0.05f, 0.05f,  120);
+        fixture.loader().applyLoad(0.05f, 0.05f, 0.05f,  120);
         fixture.tester().assertResources("Scaling down to limit since resource usage is low",
                                          4, 1, 1.8,  7.4, 13.9,
                                          fixture.autoscale());
@@ -186,13 +186,13 @@ public class AutoscalingTest {
                                        .build();
 
         NodeResources defaultResources =
-                new CapacityPolicies(fixture.tester().nodeRepository()).defaultNodeResources(fixture.cluster, fixture.application, false);
+                new CapacityPolicies(fixture.tester().nodeRepository()).defaultNodeResources(fixture.clusterSpec, fixture.applicationId, false);
 
         fixture.tester().assertResources("Min number of nodes and default resources",
                                          2, 1, defaultResources,
                                          fixture.nodes().toResources());
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(0.25, 0.95, 0.95, 120);
+        fixture.loader().applyLoad(0.25, 0.95, 0.95, 120);
         fixture.tester().assertResources("Scaling up",
                                          5, 1,
                                          defaultResources.vcpu(), defaultResources.memoryGb(), defaultResources.diskGb(),
@@ -209,7 +209,7 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(min, max))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyCpuLoad(0.3, 240);
+        fixture.loader().applyCpuLoad(0.3, 240);
         fixture.tester().assertResources("Scaling up",
                                          6, 6, 3.8,  8.0, 10.0,
                                          fixture.autoscale());
@@ -222,7 +222,7 @@ public class AutoscalingTest {
 
         // deploy
         fixture.tester().clock().advance(Duration.ofDays(1));
-        fixture.applyCpuLoad(0.25, 120);
+        fixture.loader().applyCpuLoad(0.25, 120);
         assertTrue(fixture.autoscale().isEmpty());
     }
 
@@ -240,7 +240,7 @@ public class AutoscalingTest {
                                        .build();
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(0.01, 0.01, 0.01, 120);
+        fixture.loader().applyLoad(0.01, 0.01, 0.01, 120);
         Autoscaler.Advice suggestion = fixture.suggest();
         fixture.tester().assertResources("Choosing the remote disk flavor as it has less disk",
                                          2, 1, 3.0,  100.0, 10.0,
@@ -263,7 +263,7 @@ public class AutoscalingTest {
                                        .build();
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(0.01, 0.01, 0.01, 120);
+        fixture.loader().applyLoad(0.01, 0.01, 0.01, 120);
         Autoscaler.Advice suggestion = fixture.suggest();
         fixture.tester().assertResources("Always prefers local disk for content",
                                          2, 1, 3.0,  100.0, 75.0,
@@ -277,17 +277,17 @@ public class AutoscalingTest {
         ClusterResources min = new ClusterResources( 2, 1, new NodeResources(1, 1, 1, 1));
         var fixture = AutoscalingTester.fixture().capacity(Capacity.from(min, min)).build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyCpuLoad(1.0, 120);
+        fixture.loader().applyCpuLoad(1.0, 120);
         fixture.tester().assertResources("Suggesting above capacity limit",
                                          8, 1, 9.3,  5.7, 57.1,
-                                         fixture.tester().suggest(fixture.application, fixture.cluster.id(), min, min));
+                                         fixture.tester().suggest(fixture.applicationId, fixture.clusterSpec.id(), min, min));
     }
 
     @Test
     public void not_using_out_of_service_measurements() {
         var fixture = AutoscalingTester.fixture().build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(0.9, 0.6, 0.7,  1, false, true, 120);
+        fixture.loader().applyLoad(0.9, 0.6, 0.7,  1, false, true, 120);
         assertTrue("Not scaling up since nodes were measured while cluster was out of service",
                    fixture.autoscale().isEmpty());
     }
@@ -296,7 +296,7 @@ public class AutoscalingTest {
     public void not_using_unstable_measurements() {
         var fixture = AutoscalingTester.fixture().build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(0.9, 0.6, 0.7,  1, true, false, 120);
+        fixture.loader().applyLoad(0.9, 0.6, 0.7,  1, true, false, 120);
         assertTrue("Not scaling up since nodes were measured while cluster was out of service",
                    fixture.autoscale().isEmpty());
     }
@@ -311,7 +311,7 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(min, max))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyCpuLoad(0.9, 120);
+        fixture.loader().applyCpuLoad(0.9, 120);
         fixture.tester().assertResources("Scaling the number of groups, but nothing requires us to stay with 1 node per group",
                                          10, 5, 7.7,  40.0, 40.0,
                                          fixture.autoscale());
@@ -327,9 +327,9 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(min, max))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        Duration timePassed = fixture.addCpuMeasurements(0.25, 120);
+        Duration timePassed = fixture.loader().addCpuMeasurements(0.25, 120);
         fixture.tester().clock().advance(timePassed.negated());
-        fixture.addLoadMeasurements(10, t -> t == 0 ? 20.0 : 10.0, t -> 1.0);
+        fixture.loader().addLoadMeasurements(10, t -> t == 0 ? 20.0 : 10.0, t -> 1.0);
         fixture.tester().assertResources("Scaling up since resource usage is too high, changing to 1 group is cheaper",
                                          10, 1, 2.3, 27.8, 27.8,
                                          fixture.autoscale());
@@ -346,9 +346,9 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(min, max))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        Duration timePassed = fixture.addCpuMeasurements(0.25, 120);
+        Duration timePassed = fixture.loader().addCpuMeasurements(0.25, 120);
         fixture.tester().clock().advance(timePassed.negated());
-        fixture.addLoadMeasurements(10, t -> t == 0 ? 20.0 : 10.0, t -> 100.0);
+        fixture.loader().addLoadMeasurements(10, t -> t == 0 ? 20.0 : 10.0, t -> 100.0);
         fixture.tester().assertResources("Scaling down since resource usage is too high, changing to 1 group is cheaper",
                                          6, 1, 1.0,  50.0, 50.0,
                                          fixture.autoscale());
@@ -364,7 +364,7 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(min, max))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(1));
-        fixture.applyMemLoad(1.0, 1000);
+        fixture.loader().applyMemLoad(1.0, 1000);
         fixture.tester().assertResources("Increase group size to reduce memory load",
                                          8, 2, 6.5,  96.2, 62.5,
                                          fixture.autoscale());
@@ -380,7 +380,7 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(min, max))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyMemLoad(0.02, 120);
+        fixture.loader().applyMemLoad(0.02, 120);
         fixture.tester().assertResources("Scaling down",
                                          6, 1, 3.1, 4.0, 100.0,
                                          fixture.autoscale());
@@ -389,10 +389,10 @@ public class AutoscalingTest {
     @Test
     public void scaling_down_only_after_delay() {
         var fixture = AutoscalingTester.fixture().build();
-        fixture.applyMemLoad(0.02, 120);
+        fixture.loader().applyMemLoad(0.02, 120);
         assertTrue("Too soon  after initial deployment", fixture.autoscale().target().isEmpty());
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyMemLoad(0.02, 120);
+        fixture.loader().applyMemLoad(0.02, 120);
         fixture.tester().assertResources("Scaling down since enough time has passed",
                                          6, 1, 1.2, 4.0, 80.0,
                                          fixture.autoscale());
@@ -404,7 +404,7 @@ public class AutoscalingTest {
             var fixture = AutoscalingTester.fixture()
                                            .resourceCalculator(new OnlySubtractingWhenForecastingCalculator(0))
                                            .build();
-            fixture.applyLoad(1.0, 1.0, 0.7, 1000);
+            fixture.loader().applyLoad(1.0, 1.0, 0.7, 1000);
             fixture.tester().assertResources("Scaling up",
                                              9, 1, 5.0, 9.6, 72.9,
                                              fixture.autoscale());
@@ -414,7 +414,7 @@ public class AutoscalingTest {
             var fixture = AutoscalingTester.fixture()
                                            .resourceCalculator(new OnlySubtractingWhenForecastingCalculator(3))
                                            .build();
-            fixture.applyLoad(1.0, 1.0, 0.7, 1000);
+            fixture.loader().applyLoad(1.0, 1.0, 0.7, 1000);
             fixture.tester().assertResources("With 3Gb memory tax, we scale up memory more",
                                              7, 1, 6.4, 15.8, 97.2,
                                              fixture.autoscale());
@@ -437,7 +437,7 @@ public class AutoscalingTest {
                                        .build();
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyMemLoad(0.9, 120);
+        fixture.loader().applyMemLoad(0.9, 120);
         var scaledResources = fixture.tester().assertResources("Scaling up since resource usage is too high.",
                                                                8, 1, 3,  80, 57.1,
                                                                fixture.autoscale());
@@ -445,9 +445,9 @@ public class AutoscalingTest {
         fixture.deactivateRetired(Capacity.from(scaledResources));
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyMemLoad(0.3, 1000);
+        fixture.loader().applyMemLoad(0.3, 1000);
         fixture.tester().assertResources("Scaling down since resource usage has gone down",
-                                         5, 1, 3, 80, 100,
+                                         5, 1, 3, 80, 100.0,
                                          fixture.autoscale());
     }
 
@@ -459,7 +459,7 @@ public class AutoscalingTest {
                                        .capacity(Capacity.from(min, max))
                                        .build();
         fixture.tester.clock().advance(Duration.ofDays(1));
-        fixture.applyCpuLoad(0.25, 120);
+        fixture.loader().applyCpuLoad(0.25, 120);
 
         // (no read share stored)
         fixture.tester().assertResources("Advice to scale up since we set aside for bcp by default",
@@ -482,9 +482,9 @@ public class AutoscalingTest {
         var fixture = AutoscalingTester.fixture().build();
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        Duration timeAdded = fixture.addLoadMeasurements(100, t -> t == 0 ? 20.0 : 10.0, t -> 0.0);
+        Duration timeAdded = fixture.loader().addLoadMeasurements(100, t -> t == 0 ? 20.0 : 10.0, t -> 0.0);
         fixture.tester.clock().advance(timeAdded.negated());
-        fixture.addCpuMeasurements(0.25, 200);
+        fixture.loader().addCpuMeasurements(0.25, 200);
 
         fixture.tester().assertResources("Scale up since we assume we need 2x cpu for growth when no data scaling time data",
                                          9, 1, 2.1,  5, 50,
@@ -492,20 +492,20 @@ public class AutoscalingTest {
 
         fixture.setScalingDuration(Duration.ofMinutes(5));
         fixture.tester().clock().advance(Duration.ofDays(2));
-        timeAdded = fixture.addLoadMeasurements(100, t -> 10.0 + (t < 50 ? t : 100 - t), t -> 0.0);
+        timeAdded = fixture.loader().addLoadMeasurements(100, t -> 10.0 + (t < 50 ? t : 100 - t), t -> 0.0);
         fixture.tester.clock().advance(timeAdded.negated());
-        fixture.addCpuMeasurements(0.25, 200);
+        fixture.loader().addCpuMeasurements(0.25, 200);
         fixture.tester().assertResources("Scale down since observed growth is slower than scaling time",
                                          9, 1, 1.8,  5, 50,
                                          fixture.autoscale());
 
         fixture.setScalingDuration(Duration.ofMinutes(60));
         fixture.tester().clock().advance(Duration.ofDays(2));
-        timeAdded = fixture.addLoadMeasurements(100,
-                                                t -> 10.0 + (t < 50 ? t * t * t : 125000 - (t - 49) * (t - 49) * (t - 49)),
-                                                t -> 0.0);
+        timeAdded = fixture.loader().addLoadMeasurements(100,
+                                                         t -> 10.0 + (t < 50 ? t * t * t : 125000 - (t - 49) * (t - 49) * (t - 49)),
+                                                         t -> 0.0);
         fixture.tester.clock().advance(timeAdded.negated());
-        fixture.addCpuMeasurements(0.25, 200);
+        fixture.loader().addCpuMeasurements(0.25, 200);
         fixture.tester().assertResources("Scale up since observed growth is faster than scaling time",
                                          9, 1, 2.1,  5, 50,
                                          fixture.autoscale());
@@ -515,48 +515,48 @@ public class AutoscalingTest {
     public void test_autoscaling_considers_query_vs_write_rate() {
         var fixture = AutoscalingTester.fixture().build();
 
-        fixture.addCpuMeasurements(0.4, 220);
+        fixture.loader().addCpuMeasurements(0.4, 220);
 
         // Why twice the query rate at time = 0?
         // This makes headroom for queries doubling, which we want to observe the effect of here
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        var timeAdded = fixture.addLoadMeasurements(100, t -> t == 0 ? 20.0 : 10.0, t -> 10.0);
+        var timeAdded = fixture.loader().addLoadMeasurements(100, t -> t == 0 ? 20.0 : 10.0, t -> 10.0);
         fixture.tester.clock().advance(timeAdded.negated());
-        fixture.addCpuMeasurements(0.4, 200);
+        fixture.loader().addCpuMeasurements(0.4, 200);
         fixture.tester.assertResources("Query and write load is equal -> scale up somewhat",
                                        9, 1, 2.4,  5, 50,
                                        fixture.autoscale());
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        timeAdded = fixture.addLoadMeasurements(100, t -> t == 0 ? 80.0 : 40.0, t -> 10.0);
+        timeAdded = fixture.loader().addLoadMeasurements(100, t -> t == 0 ? 80.0 : 40.0, t -> 10.0);
         fixture.tester.clock().advance(timeAdded.negated());
-        fixture.addCpuMeasurements(0.4, 200);
+        fixture.loader().addCpuMeasurements(0.4, 200);
         // TODO: Ackhually, we scale down here - why?
         fixture.tester().assertResources("Query load is 4x write load -> scale up more",
                                          9, 1, 2.1,  5, 50,
                                          fixture.autoscale());
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        timeAdded = fixture.addLoadMeasurements(100, t -> t == 0 ? 20.0 : 10.0, t -> 100.0);
+        timeAdded = fixture.loader().addLoadMeasurements(100, t -> t == 0 ? 20.0 : 10.0, t -> 100.0);
         fixture.tester.clock().advance(timeAdded.negated());
-        fixture.addCpuMeasurements(0.4, 200);
+        fixture.loader().addCpuMeasurements(0.4, 200);
         fixture.tester().assertResources("Write load is 10x query load -> scale down",
                                          9, 1, 1.1,  5, 50,
                                          fixture.autoscale());
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        timeAdded = fixture.addLoadMeasurements(100, t -> t == 0 ? 20.0 : 10.0, t-> 0.0);
+        timeAdded = fixture.loader().addLoadMeasurements(100, t -> t == 0 ? 20.0 : 10.0, t-> 0.0);
         fixture.tester.clock().advance(timeAdded.negated());
-        fixture.addCpuMeasurements(0.4, 200);
+        fixture.loader().addCpuMeasurements(0.4, 200);
         fixture.tester().assertResources("Query only -> largest possible",
                                          8, 1, 4.9,  5.7, 57.1,
                                          fixture.autoscale());
 
         fixture.tester().clock().advance(Duration.ofDays(2));
-        timeAdded = fixture.addLoadMeasurements(100, t ->  0.0, t -> 10.0);
+        timeAdded = fixture.loader().addLoadMeasurements(100, t ->  0.0, t -> 10.0);
         fixture.tester.clock().advance(timeAdded.negated());
-        fixture.addCpuMeasurements(0.4, 200);
+        fixture.loader().addCpuMeasurements(0.4, 200);
         fixture.tester().assertResources("Write only -> smallest possible",
                                          6, 1, 1.0,  8, 80,
                                          fixture.autoscale());
@@ -568,7 +568,7 @@ public class AutoscalingTest {
                                        .zone(new Zone(Environment.dev, RegionName.from("us-east")))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(1.0, 1.0, 1.0, 200);
+        fixture.loader().applyLoad(1.0, 1.0, 1.0, 200);
         assertTrue("Not attempting to scale up because policies dictate we'll only get one node",
                    fixture.autoscale().target().isEmpty());
     }
@@ -589,7 +589,7 @@ public class AutoscalingTest {
                                        .zone(new Zone(Environment.dev, RegionName.from("us-east")))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(1.0, 1.0, 1.0, 200);
+        fixture.loader().applyLoad(1.0, 1.0, 1.0, 200);
         fixture.tester().assertResources("We scale even in dev because resources are required",
                                          3, 1, 1.0,  7.7, 83.3,
                                          fixture.autoscale());
@@ -608,7 +608,7 @@ public class AutoscalingTest {
                                        .zone(new Zone(Environment.dev, RegionName.from("us-east")))
                                        .build();
         fixture.tester().clock().advance(Duration.ofDays(2));
-        fixture.applyLoad(1.0, 1.0, 1.0, 200);
+        fixture.loader().applyLoad(1.0, 1.0, 1.0, 200);
         fixture.tester().assertResources("We scale even in dev because resources are required",
                                          3, 1, 1.5,  8, 50,
                                          fixture.autoscale());
diff --git a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/AutoscalingTester.java b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/AutoscalingTester.java
index daab3b1d469..e21c57b3ef5 100644
--- a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/AutoscalingTester.java
+++ b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/AutoscalingTester.java
@@ -1,22 +1,18 @@
 // Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.hosted.provision.autoscale;
 
-import com.yahoo.collections.Pair;
 import com.yahoo.config.provision.ApplicationId;
 import com.yahoo.config.provision.Capacity;
 import com.yahoo.config.provision.ClusterResources;
 import com.yahoo.config.provision.ClusterSpec;
-import com.yahoo.config.provision.Environment;
 import com.yahoo.config.provision.Flavor;
 import com.yahoo.config.provision.HostSpec;
 import com.yahoo.config.provision.NodeResources;
 import com.yahoo.config.provision.NodeType;
-import com.yahoo.config.provision.RegionName;
 import com.yahoo.config.provision.Zone;
 import com.yahoo.test.ManualClock;
 import com.yahoo.transaction.Mutex;
 import com.yahoo.vespa.hosted.provision.Node;
-import com.yahoo.vespa.hosted.provision.NodeList;
 import com.yahoo.vespa.hosted.provision.NodeRepository;
 import com.yahoo.vespa.hosted.provision.Nodelike;
 import com.yahoo.vespa.hosted.provision.applications.Application;
@@ -29,13 +25,9 @@ import com.yahoo.vespa.hosted.provision.provisioning.HostResourcesCalculator;
 import com.yahoo.vespa.hosted.provision.provisioning.ProvisioningTester;
 
 import java.time.Duration;
-import java.time.Instant;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
-import java.util.function.IntFunction;
-import java.util.stream.Collectors;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
@@ -50,15 +42,6 @@ class AutoscalingTester {
     private final HostResourcesCalculator hostResourcesCalculator;
     private final CapacityPolicies capacityPolicies;
 
-    /** Creates an autoscaling tester with a single host type ready */
-    public AutoscalingTester(NodeResources hostResources) {
-        this(Environment.prod, hostResources);
-    }
-
-    public AutoscalingTester(Environment environment, NodeResources hostResources) {
-        this(new Zone(environment, RegionName.from("us-east")), null, List.of(hostResources));
-    }
-
     public AutoscalingTester(Zone zone, HostResourcesCalculator resourcesCalculator, List<NodeResources> hostResources) {
         this(zone, hostResources, resourcesCalculator, 20);
     }
@@ -70,10 +53,6 @@ class AutoscalingTester {
         provisioningTester.activateTenantHosts();
     }
 
-    public AutoscalingTester(Zone zone, List<Flavor> flavors) {
-        this(zone, flavors, new MockHostResourcesCalculator(zone, 3));
-    }
-
     private AutoscalingTester(Zone zone, List<Flavor> flavors, HostResourcesCalculator resourcesCalculator) {
         provisioningTester = new ProvisioningTester.Builder().zone(zone)
                                                              .flavors(flavors)
@@ -131,10 +110,6 @@ class AutoscalingTester {
             nodeRepository().nodes().setReady(List.of(host), Agent.system, getClass().getSimpleName());
     }
 
-    public void deactivateRetired(ApplicationId application, ClusterSpec cluster, ClusterResources resources) {
-        deactivateRetired(application, cluster, Capacity.from(resources));
-    }
-
     public void deactivateRetired(ApplicationId application, ClusterSpec cluster, Capacity capacity) {
         try (Mutex lock = nodeRepository().nodes().lock(application)) {
             for (Node node : nodeRepository().nodes().list(Node.State.active).owner(application)) {
@@ -145,145 +120,6 @@ class AutoscalingTester {
         deploy(application, cluster, capacity);
     }
 
-    public ClusterModel clusterModel(ApplicationId applicationId, ClusterSpec clusterSpec) {
-        var application = nodeRepository().applications().get(applicationId).get();
-        return new ClusterModel(application,
-                                clusterSpec,
-                                application.cluster(clusterSpec.id()).get(),
-                                nodeRepository().nodes().list(Node.State.active).cluster(clusterSpec.id()),
-                                nodeRepository().metricsDb(),
-                                nodeRepository().clock());
-    }
-
-    /**
-     * Adds measurements with the given resource value and ideal values for the other resources,
-     * scaled to take one node redundancy into account.
-     * (I.e we adjust to measure a bit lower load than "naively" wanted to offset for the autoscaler
-     * wanting to see the ideal load with one node missing.)
-     *
-     * @param otherResourcesLoad the load factor relative to ideal to use for other resources
-     * @param count the number of measurements
-     * @param applicationId the application we're adding measurements for all nodes of
-     */
-    public Duration addCpuMeasurements(float value, float otherResourcesLoad,
-                                       int count, ApplicationId applicationId) {
-        NodeList nodes = nodeRepository().nodes().list(Node.State.active).owner(applicationId);
-        float oneExtraNodeFactor = (float)(nodes.size() - 1.0) / (nodes.size());
-        Instant initialTime = clock().instant();
-        for (int i = 0; i < count; i++) {
-            clock().advance(Duration.ofSeconds(150));
-            for (Node node : nodes) {
-                Load load = new Load(value,
-                                     ClusterModel.idealMemoryLoad * otherResourcesLoad,
-                                     ClusterModel.idealContentDiskLoad * otherResourcesLoad).multiply(oneExtraNodeFactor);
-                nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
-                                                                  new NodeMetricSnapshot(clock().instant(),
-                                                                                         load,
-                                                                                         0,
-                                                                                         true,
-                                                                                         true,
-                                                                                         0.0))));
-            }
-        }
-        return Duration.between(initialTime, clock().instant());
-    }
-
-    /**
-     * Adds measurements with the given resource value and ideal values for the other resources,
-     * scaled to take one node redundancy into account.
-     * (I.e we adjust to measure a bit lower load than "naively" wanted to offset for the autoscaler
-     * wanting to see the ideal load with one node missing.)
-     *
-     * @param otherResourcesLoad the load factor relative to ideal to use for other resources
-     * @param count the number of measurements
-     * @param applicationId the application we're adding measurements for all nodes of
-     * @return the duration added to the current time by this
-     */
-    public Duration addDiskMeasurements(float value, float otherResourcesLoad,
-                                        int count, ApplicationId applicationId) {
-        NodeList nodes = nodeRepository().nodes().list(Node.State.active).owner(applicationId);
-        float oneExtraNodeFactor = (float)(nodes.size() - 1.0) / (nodes.size());
-        Instant initialTime = clock().instant();
-        for (int i = 0; i < count; i++) {
-            clock().advance(Duration.ofSeconds(150));
-            for (Node node : nodes) {
-                Load load = new Load(ClusterModel.idealQueryCpuLoad * otherResourcesLoad,
-                                     ClusterModel.idealContentDiskLoad * otherResourcesLoad,
-                                     value).multiply(oneExtraNodeFactor);
-                nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
-                                                                  new NodeMetricSnapshot(clock().instant(),
-                                                                                         load,
-                                                                                         0,
-                                                                                         true,
-                                                                                         true,
-                                                                                         0.0))));
-            }
-        }
-        return Duration.between(initialTime, clock().instant());
-    }
-
-    /**
-     * Adds measurements with the given resource value and ideal values for the other resources,
-     * scaled to take one node redundancy into account.
-     * (I.e we adjust to measure a bit lower load than "naively" wanted to offset for the autoscaler
-     * wanting to see the ideal load with one node missing.)
-     *
-     * @param otherResourcesLoad the load factor relative to ideal to use for other resources
-     * @param count the number of measurements
-     * @param applicationId the application we're adding measurements for all nodes of
-     */
-    public void addMemMeasurements(float value, float otherResourcesLoad,
-                                   int count, ApplicationId applicationId) {
-        NodeList nodes = nodeRepository().nodes().list(Node.State.active).owner(applicationId);
-        float oneExtraNodeFactor = (float)(nodes.size() - 1.0) / (nodes.size());
-        for (int i = 0; i < count; i++) {
-            clock().advance(Duration.ofMinutes(1));
-            for (Node node : nodes) {
-                float cpu  = (float) 0.2 * otherResourcesLoad * oneExtraNodeFactor;
-                float memory = value * oneExtraNodeFactor;
-                float disk = (float) ClusterModel.idealContentDiskLoad * otherResourcesLoad * oneExtraNodeFactor;
-                Load load = new Load(0.2 * otherResourcesLoad,
-                                     value,
-                                     ClusterModel.idealContentDiskLoad * otherResourcesLoad).multiply(oneExtraNodeFactor);
-                nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
-                                                                  new NodeMetricSnapshot(clock().instant(),
-                                                                                         load,
-                                                                                         0,
-                                                                                         true,
-                                                                                         true,
-                                                                                         0.0))));
-            }
-        }
-    }
-
-    public void addMeasurements(float cpu, float memory, float disk, int count, ApplicationId applicationId)  {
-        addMeasurements(cpu, memory, disk, 0, true, true, count, applicationId);
-    }
-
-    public void addMeasurements(float cpu, float memory, float disk, int generation, boolean inService, boolean stable,
-                                int count, ApplicationId applicationId) {
-        NodeList nodes = nodeRepository().nodes().list(Node.State.active).owner(applicationId);
-        for (int i = 0; i < count; i++) {
-            clock().advance(Duration.ofMinutes(1));
-            for (Node node : nodes) {
-                nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
-                                                                  new NodeMetricSnapshot(clock().instant(),
-                                                                                         new Load(cpu, memory, disk),
-                                                                                         generation,
-                                                                                         inService,
-                                                                                         stable,
-                                                                                         0.0))));
-            }
-        }
-    }
-
-    public void storeReadShare(double currentReadShare, double maxReadShare, ApplicationId applicationId) {
-        Application application = nodeRepository().applications().require(applicationId);
-        application = application.with(application.status().withCurrentReadShare(currentReadShare)
-                                                           .withMaxReadShare(maxReadShare));
-        nodeRepository().applications().put(application, nodeRepository().nodes().lock(applicationId));
-    }
-
     /** Creates a single redeployment event with bogus data except for the given duration */
     public void setScalingDuration(ApplicationId applicationId, ClusterSpec.Id clusterId, Duration duration) {
         Application application = nodeRepository().applications().require(applicationId);
@@ -304,47 +140,6 @@ class AutoscalingTester {
         nodeRepository().applications().put(application, nodeRepository().nodes().lock(applicationId));
     }
 
-    /** Creates the given number of measurements, spaced 5 minutes between, using the given function */
-    public Duration addLoadMeasurements(ApplicationId application,
-                                    ClusterSpec.Id cluster,
-                                    int measurements,
-                                    IntFunction<Double> queryRate,
-                                    IntFunction<Double> writeRate) {
-        Instant initialTime = clock().instant();
-        for (int i = 0; i < measurements; i++) {
-            nodeMetricsDb().addClusterMetrics(application,
-                                              Map.of(cluster, new ClusterMetricSnapshot(clock().instant(),
-                                                                                        queryRate.apply(i),
-                                                                                        writeRate.apply(i))));
-            clock().advance(Duration.ofMinutes(5));
-        }
-        return Duration.between(initialTime, clock().instant());
-    }
-
-    /** Creates the given number of measurements, spaced 5 minutes between, using the given function */
-    public Duration addQueryRateMeasurements(ApplicationId application,
-                                             ClusterSpec.Id cluster,
-                                             int measurements,
-                                             IntFunction<Double> queryRate) {
-        return addQueryRateMeasurements(application, cluster, measurements, Duration.ofMinutes(5), queryRate);
-    }
-
-    public Duration addQueryRateMeasurements(ApplicationId application,
-                                             ClusterSpec.Id cluster,
-                                             int measurements,
-                                             Duration samplingInterval,
-                                             IntFunction<Double> queryRate) {
-        Instant initialTime = clock().instant();
-        for (int i = 0; i < measurements; i++) {
-            nodeMetricsDb().addClusterMetrics(application,
-                                              Map.of(cluster, new ClusterMetricSnapshot(clock().instant(),
-                                                                                        queryRate.apply(i),
-                                                                                        0.0)));
-            clock().advance(samplingInterval);
-        }
-        return Duration.between(initialTime, clock().instant());
-    }
-
     public Autoscaler.Advice autoscale(ApplicationId applicationId, ClusterSpec cluster, Capacity capacity) {
         capacity = capacityPolicies.applyOn(capacity, applicationId, capacityPolicies.decideExclusivity(capacity, cluster.isExclusive()));
         Application application = nodeRepository().applications().get(applicationId).orElse(Application.empty(applicationId))
diff --git a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Fixture.java b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Fixture.java
index 56ffc4ef993..88ddb0ad9f8 100644
--- a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Fixture.java
+++ b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Fixture.java
@@ -1,6 +1,7 @@
 // Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.hosted.provision.autoscale;
 
+import com.yahoo.collections.Pair;
 import com.yahoo.config.provision.ApplicationId;
 import com.yahoo.config.provision.Capacity;
 import com.yahoo.config.provision.Cloud;
@@ -10,14 +11,17 @@ import com.yahoo.config.provision.Environment;
 import com.yahoo.config.provision.NodeResources;
 import com.yahoo.config.provision.RegionName;
 import com.yahoo.config.provision.Zone;
+import com.yahoo.vespa.hosted.provision.Node;
 import com.yahoo.vespa.hosted.provision.NodeList;
 import com.yahoo.vespa.hosted.provision.applications.Application;
 import com.yahoo.vespa.hosted.provision.applications.Cluster;
 import com.yahoo.vespa.hosted.provision.provisioning.HostResourcesCalculator;
 
 import java.time.Duration;
+import java.time.Instant;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import java.util.function.IntFunction;
 import java.util.stream.Collectors;
@@ -30,38 +34,51 @@ import java.util.stream.Collectors;
 public class Fixture {
 
     final AutoscalingTester tester;
-    final ApplicationId application;
-    final ClusterSpec cluster;
+    final ApplicationId applicationId;
+    final ClusterSpec clusterSpec;
     final Capacity capacity;
+    final Loader loader;
 
     public Fixture(Fixture.Builder builder, Optional<ClusterResources> initialResources) {
-        application = builder.application;
-        cluster = builder.cluster;
+        applicationId = builder.application;
+        clusterSpec = builder.cluster;
         capacity = builder.capacity;
         tester = new AutoscalingTester(builder.zone, builder.resourceCalculator, builder.hostResources);
         var deployCapacity = initialResources.isPresent() ? Capacity.from(initialResources.get()) : capacity;
         tester.deploy(builder.application, builder.cluster, deployCapacity);
+        this.loader = new Loader(this);
     }
 
     public AutoscalingTester tester() { return tester; }
 
-    public ApplicationId applicationId() { return application; }
+    public ApplicationId applicationId() { return applicationId; }
 
-    public ClusterSpec.Id clusterId() { return cluster.id(); }
+    public ClusterSpec.Id clusterId() { return clusterSpec.id(); }
 
     public Application application() {
-        return tester().nodeRepository().applications().get(application).orElse(Application.empty(application));
+        return tester().nodeRepository().applications().get(applicationId).orElse(Application.empty(applicationId));
     }
 
     public Cluster cluster() {
         return application().cluster(clusterId()).get();
     }
 
+    public ClusterModel clusterModel() {
+        return new ClusterModel(application(),
+                                clusterSpec,
+                                cluster(),
+                                nodes(),
+                                tester.nodeRepository().metricsDb(),
+                                tester.nodeRepository().clock());
+    }
+
     /** Returns the nodes allocated to the fixture application cluster */
     public NodeList nodes() {
-        return tester().nodeRepository().nodes().list().owner(application).cluster(cluster.id());
+        return tester().nodeRepository().nodes().list(Node.State.active).owner(applicationId).cluster(clusterSpec.id());
     }
 
+    public Loader loader() { return loader; }
+
     /** Autoscale within the deployed capacity of this. */
     public Autoscaler.Advice autoscale() {
         return autoscale(capacity);
@@ -69,12 +86,12 @@ public class Fixture {
 
     /** Autoscale within the given capacity. */
     public Autoscaler.Advice autoscale(Capacity capacity) {
-        return tester().autoscale(application, cluster, capacity);
+        return tester().autoscale(applicationId, clusterSpec, capacity);
     }
 
     /** Compute an autoscaling suggestion for this. */
     public Autoscaler.Advice suggest() {
-        return tester().suggest(application, cluster.id(), capacity.minResources(), capacity.maxResources());
+        return tester().suggest(applicationId, clusterSpec.id(), capacity.minResources(), capacity.maxResources());
     }
 
     /** Redeploy with the deployed capacity of this. */
@@ -84,62 +101,22 @@ public class Fixture {
 
     /** Redeploy with the given capacity. */
     public void deploy(Capacity capacity) {
-        tester().deploy(application, cluster, capacity);
+        tester().deploy(applicationId, clusterSpec, capacity);
     }
 
     public void deactivateRetired(Capacity capacity) {
-        tester().deactivateRetired(application, cluster, capacity);
+        tester().deactivateRetired(applicationId, clusterSpec, capacity);
     }
 
     public void setScalingDuration(Duration duration) {
-        tester().setScalingDuration(application, cluster.id(), duration);
-    }
-
-    public Duration addCpuMeasurements(double cpuLoad, int measurements) {
-        return tester().addCpuMeasurements((float)cpuLoad, 1.0f, measurements, application);
-    }
-
-    public Duration addLoadMeasurements(int measurements, IntFunction<Double> queryRate, IntFunction<Double> writeRate) {
-        return tester().addLoadMeasurements(application, cluster.id(), measurements, queryRate, writeRate);
-    }
-
-    public void applyCpuLoad(double cpuLoad, int measurements) {
-        Duration samplingInterval = Duration.ofSeconds(150L); // in addCpuMeasurements
-        tester().addCpuMeasurements((float)cpuLoad, 1.0f, measurements, application);
-        tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
-        tester().addQueryRateMeasurements(application, cluster.id(), measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
-    }
-
-    public void applyMemLoad(double memLoad, int measurements) {
-        Duration samplingInterval = Duration.ofSeconds(150L); // in addMemMeasurements
-        tester().addMemMeasurements((float)memLoad, 1.0f, measurements, application);
-        tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
-        tester().addQueryRateMeasurements(application, cluster.id(), measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
-    }
-
-    public void applyDiskLoad(double diskLoad, int measurements) {
-        Duration samplingInterval = Duration.ofSeconds(150L); // in addDiskMeasurements
-        tester().addDiskMeasurements((float)diskLoad, 1.0f, measurements, application);
-        tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
-        tester().addQueryRateMeasurements(application, cluster.id(), measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
-    }
-
-    public void applyLoad(double cpuLoad, double memoryLoad, double diskLoad, int measurements) {
-        Duration samplingInterval = Duration.ofSeconds(150L); // in addCpuMeasurements
-        tester().addMeasurements((float)cpuLoad, (float)memoryLoad, (float)diskLoad, measurements, application);
-        tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
-        tester().addQueryRateMeasurements(application, cluster.id(), measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
-    }
-
-    public void applyLoad(double cpuLoad, double memoryLoad, double diskLoad, int generation, boolean inService, boolean stable, int measurements) {
-        Duration samplingInterval = Duration.ofSeconds(150L); // in addCpuMeasurements
-        tester().addMeasurements((float)cpuLoad, (float)memoryLoad, (float)diskLoad, generation, inService, stable, measurements, application);
-        tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
-        tester().addQueryRateMeasurements(application, cluster.id(), measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
+        tester().setScalingDuration(applicationId, clusterSpec.id(), duration);
     }
 
     public void storeReadShare(double currentReadShare, double maxReadShare) {
-        tester().storeReadShare(currentReadShare, maxReadShare, application);
+        var application = application();
+        application = application.with(application.status().withCurrentReadShare(currentReadShare)
+                                                  .withMaxReadShare(maxReadShare));
+        tester.nodeRepository().applications().put(application, tester.nodeRepository().nodes().lock(applicationId));
     }
 
     public static class Builder {
diff --git a/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Loader.java b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Loader.java
new file mode 100644
index 00000000000..db4fe917b53
--- /dev/null
+++ b/node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Loader.java
@@ -0,0 +1,158 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.vespa.hosted.provision.autoscale;
+
+import com.yahoo.collections.Pair;
+import com.yahoo.vespa.hosted.provision.Node;
+import com.yahoo.vespa.hosted.provision.NodeList;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.function.IntFunction;
+
+/**
+ * A helper for applying load to an application represented by a fixture,
+ *
+ * @author bratseth
+ */
+public class Loader {
+
+    private final Fixture fixture;
+
+    public Loader(Fixture fixture) {
+        this.fixture = fixture;
+    }
+
+    /**
+     * Adds measurements with the given resource value and ideal values for the other resources,
+     * scaled to take one node redundancy into account.
+     * (I.e we adjust to measure a bit lower load than "naively" wanted to offset for the autoscaler
+     * wanting to see the ideal load with one node missing.)
+     *
+     * @param count the number of measurements
+     */
+    public Duration addCpuMeasurements(double value, int count) {
+        NodeList nodes = fixture.nodes();
+        float oneExtraNodeFactor = (float)(nodes.size() - 1.0) / (nodes.size());
+        Instant initialTime = fixture.tester().clock().instant();
+        for (int i = 0; i < count; i++) {
+            fixture.tester().clock().advance(Duration.ofSeconds(150));
+            for (Node node : nodes) {
+                Load load = new Load(value,
+                                     ClusterModel.idealMemoryLoad,
+                                     ClusterModel.idealContentDiskLoad).multiply(oneExtraNodeFactor);
+                fixture.tester().nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
+                                                                         new NodeMetricSnapshot(fixture.tester().clock().instant(),
+                                                                                                load,
+                                                                                                0,
+                                                                                                true,
+                                                                                                true,
+                                                                                                0.0))));
+            }
+        }
+        return Duration.between(initialTime, fixture.tester().clock().instant());
+    }
+
+    /** Creates the given number of measurements, spaced 5 minutes between, using the given function */
+    public Duration addLoadMeasurements(int measurements, IntFunction<Double> queryRate, IntFunction<Double> writeRate) {
+        Instant initialTime = fixture.tester().clock().instant();
+        for (int i = 0; i < measurements; i++) {
+            fixture.tester().nodeMetricsDb().addClusterMetrics(fixture.applicationId(),
+                                                               Map.of(fixture.clusterId(), new ClusterMetricSnapshot(fixture.tester().clock().instant(),
+                                                                                                                     queryRate.apply(i),
+                                                                                                                     writeRate.apply(i))));
+            fixture.tester().clock().advance(Duration.ofMinutes(5));
+        }
+        return Duration.between(initialTime, fixture.tester().clock().instant());
+    }
+
+    public void applyCpuLoad(double cpuLoad, int measurements) {
+        Duration samplingInterval = Duration.ofSeconds(150L); // in addCpuMeasurements
+        addCpuMeasurements((float)cpuLoad, measurements);
+        fixture.tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
+        addQueryRateMeasurements(measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
+    }
+
+    public void applyMemLoad(double memLoad, int measurements) {
+        Duration samplingInterval = Duration.ofSeconds(150L); // in addMemMeasurements
+        addMemMeasurements(memLoad, measurements);
+        fixture.tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
+        addQueryRateMeasurements(measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
+    }
+
+    /**
+     * Adds measurements with the given resource value and ideal values for the other resources,
+     * scaled to take one node redundancy into account.
+     * (I.e we adjust to measure a bit lower load than "naively" wanted to offset for the autoscaler
+     * wanting to see the ideal load with one node missing.)
+     */
+    public void addMemMeasurements(double value, int count) {
+        NodeList nodes = fixture.nodes();
+        float oneExtraNodeFactor = (float)(nodes.size() - 1.0) / (nodes.size());
+        for (int i = 0; i < count; i++) {
+            fixture.tester().clock().advance(Duration.ofMinutes(1));
+            for (Node node : nodes) {
+                Load load = new Load(0.2,
+                                     value,
+                                     ClusterModel.idealContentDiskLoad).multiply(oneExtraNodeFactor);
+                fixture.tester().nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
+                                                                        new NodeMetricSnapshot(fixture.tester().clock().instant(),
+                                                                                               load,
+                                                                                               0,
+                                                                                               true,
+                                                                                               true,
+                                                                                               0.0))));
+            }
+        }
+    }
+
+    public Duration addMeasurements(double cpu, double memory, double disk, int count)  {
+        return addMeasurements(cpu, memory, disk, 0, true, true, count);
+    }
+
+    public Duration addMeasurements(double cpu, double memory, double disk, int generation, boolean inService, boolean stable,
+                                    int count) {
+        Instant initialTime = fixture.tester().clock().instant();
+        for (int i = 0; i < count; i++) {
+            fixture.tester().clock().advance(Duration.ofMinutes(1));
+            for (Node node : fixture.nodes()) {
+                fixture.tester().nodeMetricsDb().addNodeMetrics(List.of(new Pair<>(node.hostname(),
+                                                                        new NodeMetricSnapshot(fixture.tester().clock().instant(),
+                                                                                               new Load(cpu, memory, disk),
+                                                                                               generation,
+                                                                                               inService,
+                                                                                               stable,
+                                                                                               0.0))));
+            }
+        }
+        return Duration.between(initialTime, fixture.tester().clock().instant());
+    }
+
+    public void applyLoad(double cpuLoad, double memoryLoad, double diskLoad, int measurements) {
+        Duration samplingInterval = Duration.ofSeconds(150L); // in addCpuMeasurements
+        addMeasurements(cpuLoad, memoryLoad, diskLoad, measurements);
+        fixture.tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
+        addQueryRateMeasurements(measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
+    }
+
+    public void applyLoad(double cpuLoad, double memoryLoad, double diskLoad, int generation, boolean inService, boolean stable, int measurements) {
+        Duration samplingInterval = Duration.ofSeconds(150L); // in addCpuMeasurements
+        addMeasurements(cpuLoad, memoryLoad, diskLoad, generation, inService, stable, measurements);
+        fixture.tester().clock().advance(samplingInterval.negated().multipliedBy(measurements));
+        addQueryRateMeasurements(measurements, samplingInterval, t -> t == 0 ? 20.0 : 10.0); // Query traffic only
+    }
+
+    public Duration addQueryRateMeasurements(int measurements, Duration samplingInterval, IntFunction<Double> queryRate) {
+        Instant initialTime = fixture.tester().clock().instant();
+        for (int i = 0; i < measurements; i++) {
+            fixture.tester().nodeMetricsDb().addClusterMetrics(fixture.applicationId(),
+                                                     Map.of(fixture.clusterId(), new ClusterMetricSnapshot(fixture.tester().clock().instant(),
+                                                                                                   queryRate.apply(i),
+                                                                                                   0.0)));
+            fixture.tester().clock().advance(samplingInterval);
+        }
+        return Duration.between(initialTime, fixture.tester().clock().instant());
+    }
+
+}