The answer is in a gray zone. The laws exist, but they are suspended for the time being. The German government has wanted data retention laws for many years already. Due to the prevalent laws, the obligations got suspended in 2017, but they could be pretty intrusive if they were active. Law implementation would require every telecom and ISP to keep your metadata for as long as ten weeks. Metadata includes your browsing history, sent emails, downloads, uploads, SMS messages, whether you're on a landline or a mobile one and when, and your IP address. The laws are not interested in the actual content of your activities or conversations, except for text messages which must be kept in full. However, another German federal law protects content data.