In order to achieve compliance with GDPR (General Data Protection Regulation) I disabled Google Analytics for this blog.
I decided to refrain from storing ANY data on my side, but this blog is currently using Disqus, a service which enables you to leave comments on my articles. They do collect, use and share information. You may want to read their data privacy statement.
Update 09.10.2019: I just disabled Disqus completely.