> @@ -330,19 +340,21 @@ protected ConcreteBuilder self() {
> private final boolean isSourceNAT;
> private final double rawUsageHours;
> private final String usage;
> + private final long size;
Is this parameter returned *always*? I see it declared as `@Nullable`. If it
can be missing, then declare the variable as a `Long` object (primitives can't
be null and NPEs will appear); otherwise remove the nullable annotation.
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