Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2210
The problem was that the `currentLowWatermark` gauges weren't deregistered
after the job terminated. This metric is registered by the
`StreamInputProcessor` directly on the `IOMetricGroup` but never deregistered,
because the `ioMetrics` group is never closed by the `TaskMetricGroup`.
I guess that the problem is then that the `StreamInputProcessor` shouldn't
register the `currentLowWatermark` metric. Instead, the IOMetricGroup should
preregister the corresponding metric?
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