From a07bb80ad57e6a5f95218228c63e92450f768081 Mon Sep 17 00:00:00 2001
From: Arne Juul <arnej@verizonmedia.com>
Date: Thu, 28 Jan 2021 08:54:24 +0000
Subject: add maybePublishOldMetrics hook

---
 .../vespa/clustercontroller/core/FleetController.java    | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/FleetController.java b/clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/FleetController.java
index 16b7894211e..6dc4b1e8015 100644
--- a/clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/FleetController.java
+++ b/clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/FleetController.java
@@ -74,6 +74,7 @@ public class FleetController implements NodeStateOrHostInfoChangeHandler, NodeAd
     private boolean processingCycle = false;
     private boolean wantedStateChanged = false;
     private long cycleCount = 0;
+    private long lastMetricUpdateCycleCount = 0;
     private long nextStateSendTime = 0;
     private Long controllerThreadId = null;
 
@@ -384,6 +385,7 @@ public class FleetController implements NodeStateOrHostInfoChangeHandler, NodeAd
         ClusterState baselineState = stateBundle.getBaselineClusterState();
         newStates.add(stateBundle);
         metricUpdater.updateClusterStateMetrics(cluster, baselineState);
+        lastMetricUpdateCycleCount = cycleCount;
         systemStateBroadcaster.handleNewClusterStates(stateBundle);
         // Iff master, always store new version in ZooKeeper _before_ publishing to any
         // nodes so that a cluster controller crash after publishing but before a successful
@@ -393,6 +395,19 @@ public class FleetController implements NodeStateOrHostInfoChangeHandler, NodeAd
         }
     }
 
+    private boolean maybePublishOldMetrics() {
+        verifyInControllerThread();
+        if (cycleCount > 300 + lastMetricUpdateCycleCount) {
+            ClusterStateBundle stateBundle = stateVersionTracker.getVersionedClusterStateBundle();
+            ClusterState baselineState = stateBundle.getBaselineClusterState();
+            metricUpdater.updateClusterStateMetrics(cluster, baselineState);
+            lastMetricUpdateCycleCount = cycleCount;
+            return true;
+        } else {
+            return false;
+        }
+    }
+
     private void storeClusterStateMetaDataToZooKeeper(ClusterStateBundle stateBundle) {
         try {
             database.saveLatestSystemStateVersion(databaseContext, stateBundle.getVersion());
@@ -605,6 +620,7 @@ public class FleetController implements NodeStateOrHostInfoChangeHandler, NodeAd
             if ( ! isRunning()) { return; }
             didWork |= processNextQueuedRemoteTask();
             didWork |= completeSatisfiedVersionDependentTasks();
+            didWork |= maybePublishOldMetrics();
 
             processingCycle = false;
             ++cycleCount;
-- 
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