Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/5857#discussion_r191175257
--- Diff:
flink-metrics/flink-metrics-prometheus/src/main/java/org/apache/flink/metrics/prometheus/PrometheusReporter.java
---
@@ -120,199 +83,4 @@ public void close() {
CollectorRegistry.defaultRegistry.clear();
--- End diff --
replace with `super.close()`---
