Since there are not that much PRs open and in progress, this is maybe the least intrusive moment to cleanup some code using the given uncrustify.cfg
If there is a PR merge issue, checkout the PR and perform an uncrustify first before trying to merge.
The SPIFFS may become fragmented, so it is possible a file cannot be appended to even though there is room on the file system.
So there has to be a proper check to see if writing fails and also delete oldest file(s) when needed + call to the garbage collector.
See also https://github.com/esp8266/Arduino/issues/5987
Calling `/dumpcache' will generate a CSV file of all logged data.
This may block the ESP for a while, since it outputs about 250 samples per second.
So 480'000 bytes of flash storage takes roughly 70 seconds to dump to a 1.6 MByte CSV. (20'000 samples)