sigram commented on a change in pull request #1758:
URL: https://github.com/apache/lucene-solr/pull/1758#discussion_r473682999
##########
File path:
solr/core/src/java/org/apache/solr/cluster/events/ClusterSingleton.java
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@@ -0,0 +1,14 @@
+package org.apache.solr.cluster.events;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Intended for {@link org.apache.solr.core.CoreContainer} plugins that should
be
+ * enabled only one instance per cluster.
+ * <p>Implementation detail: currently these plugins are instantiated on the
+ * Overseer leader, and closed when the current node loses its leadership.</p>
+ */
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ClusterSingleton {
Review comment:
@chatman this event API originated from the "triggers" API in 8x but can
equally well be used outside the autoscaling - so in the above diagram it
doesn't depend on autoscaling, it's adjacent to it.
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