When measuring the reliability of my vacuum, I don't go by component, so I don't go by line when I measure the reliability of my code.

Ok if we measure uptime of the software I’ve written it’s far higher than 99%.

Again, we're not measuring uptime. We're measuring how many of them had at least one bug.

So if your vacuum had one component that was out of spec, but didn’t put it out of commission for any length of time, it’s 0% reliable?