public SqlStatisticsHolderMemoryQuotas(QueryMemoryManager memMgr, GridMetricManager metricMgr) {
        MetricRegistry quotasMetrics = metricMgr.registry(SQL_QUOTAS_REG_NAME);

        quotaRequestedCnt = quotasMetrics.longAdderMetric("requests",
            "How many times memory quota have been requested on this node by all the queries in total. " +
                "Always 0 if sql memory quotas are disabled.");

        quotasMetrics.register("maxMem",
            new LongSupplier() {
                @Override public long getAsLong() {
                    return memMgr.maxMemory();
                }
            },
            "How much memory in bytes it is possible to reserve by all the queries in total on this node. " +
                "Negative value if sql memory quotas are disabled. " +
                "Individual queries have additional per query quotas."
        );

        quotasMetrics.register("freeMem",
            new LongSupplier() {
                @Override public long getAsLong() {
                    return memMgr.maxMemory() - memMgr.memoryReserved();
                }
            },
            "How much memory in bytes currently left available for the queries on this node. " +
                "Negative value if sql memory quotas are disabled."
        );
    }