Add cluster feed block support to cluster controller

Will push out a new cluster state bundle indicating cluster feed blocked
if one or more nodes in the cluster has one or more resources exhausted.
Similarly, a new state will be pushed out once no nodes have resources
exhausted any more.

The feed block description currently contains up to 3 separate exhausted
resources, possibly across multiple nodes.

A cluster-level event is emitted for both the block and unblock edges.

No hysteresis is present yet, so if a node is oscillating around a block-limit,
so will the cluster state.

1 files changed, 2 insertions, 2 deletions

diff --git a/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterFixture.java b/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterFixture.java
index 2df9279e450..a6cf10d4022 100644
--- a/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterFixture.java
+++ b/clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterFixture.java
@@ -219,11 +219,11 @@ public class ClusterFixture {
         return this.cluster;
     }
 
-    static Node storageNode(int index) {
+    public static Node storageNode(int index) {
         return new Node(NodeType.STORAGE, index);
     }
 
-    static Node distributorNode(int index) {
+    public static Node distributorNode(int index) {
         return new Node(NodeType.DISTRIBUTOR, index);
     }
 }