public synchronized void removeGangliaReporter() {
        if (null != gangliaReporter)
            gangliaReporter.stop();

        gangliaReporter = null;
    }
Stop a {@link GangliaReporter} previously created by a call to
addGangliaReporter(String, int, GMetric.UDPAddressingMode, int, Boolean, UUID, long)
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