tflobbe commented on a change in pull request #1247: SOLR-14252 use double 
rather than Double to avoid NPE
URL: https://github.com/apache/lucene-solr/pull/1247#discussion_r379047264
 
 

 ##########
 File path: solr/core/src/java/org/apache/solr/metrics/AggregateMetric.java
 ##########
 @@ -51,6 +61,18 @@ public String toString() {
           ", updateCount=" + updateCount +
           '}';
     }
+
+    public double toDouble() {
+      if (value instanceof Boolean) {
+        return 0;
+      } 
+      if (!(value instanceof Number)) {
+        log.debug("not a Number: " + value);
 
 Review comment:
   Can you use parametrized logging?

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