public synchronized void removeCsvReporter() {
        if (null != csvReporter)
            csvReporter.stop();

        csvReporter = null;
    }
Stop a {@link CsvReporter} previously created by a call to
{@link #addCsvReporter(long, String)} and release it for GC. Idempotent
between calls to the associated add method. Does nothing before the first
call to the associated add method.
gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/util/MetricManager.java