presto-memory-context/src/main/java/io/prestosql/memory/context/SimpleLocalMemoryContext.java/SimpleLocalMemoryContext/toString
class SimpleLocalMemoryContext:    @Override
    public synchronized String toString()
    {
        return toStringHelper(this)
                .add("allocationTag", allocationTag)
                .add("usedBytes", usedBytes)
                .toString();
    }