Background activity services are described here: https://www.dynatrace.com/support/help/shortlink/s...
Couldn't tell from a screenshot why you'd be having capture errors, see if there's any more details there and consider checking with support.
What you are sing there are corrupted purepahts on the process detected as "background process". Corrupted Purepaths can have different reasons, like:
The Purepaths will show everything Oneagent grabbed so you look into what failed.
If it was a call out to some public resource that took too long or a call out to a host/process that was particularly burdened at the time. If you know what process is behind the purepath at the point of corruption, then you might be able to see explanations in the logs about why the subpath was dropped or lead to corruption of the larger path.