I get that equipment on some hops just don't support pinging so those will always show 100% loss. Some hops, however, show intermittent loss - which I'm assuming is a problem. So by my understanding a hop that shows, for example, 75.3% loss is likely causing a problem.
However - in the latency graph below I don't fully understand why those packet losses don't show up more often as red vertical lines. Is this because tcp/ip retries are successful, or is it because I am misunderstanding the tests?