It's tempting to inject meaning into spring training, but you just have to take it as axiomatic that the results do not even matter one bit. Individual player performances sort of matter, especially for guys trying to earn spots or prove themselves. Beyond that it is glorified practice.
I don't have any numbers off hand, but I recall that the good Pirates teams had some years of "bad" spring training records.
The HRs aren't ideal, obviously, but also can be contextualized based on how easy it is to give up HRs in spring training. What I kind of look for is the individual results of some players, such as Hayes for example. But even though his limited stat line is good right now, it also doesn't tell you than one of his 0-1 flyouts to the OF was an absolute rocket right at the RF. That's small stuff.
With pitchers, I think it's slightly more telling, but only slightly. I'd be more concerned about the totality of somebody's performance, not really in terms of traditional statlines, but more what they did each time. So for instance with Keller, he had a few hard hit balls off of him, but still executed pretty well and has put together two solid, short outings. You hope that when he's stretched out further, he puts a nice couple outings together, but even if he gets a bit touched up in one of them, it's not a big deal. If he can't find the plate or gets touched up in almost all of them, that's slightly different. For relievers, it's basically the same. You never like to see guys you'll count on giving up dingers, but I'll only raise an eyebrow if Kela has two very bad additional outings or something, or something way more alarming like his velocity is down.