Web sites are allowed to log data (including visitor requests and IPs) required for the smooth running of the site. It could be argued that keeping logs allows for trouble-shooting so web server logging is probably OK in most circumstances.
However, there is no reason to keep months/years of logs around. Having this data is actually a liability under the GDPR and you should be aggressively deleting logs after a few days.
[0] https://sheep.horse/2018/6/the_eu_general_data_protection_re...
