Yes any form of fingerprinting. Including anything stored on a user, the computer is considered personal information including and perhaps especially creating a user ID that you use to connect with other data without consent.
I agree, It is very fiddly to get right because you need particular care if other collected data could become a privacy risk (Such as hello <> in the page title). But I also feel that it is critical to monitor services at the user-interface level in production, so it is worth the trouble to get right.
I understand anonymous session tracking for the purpose of maintaining a site to be within the law if properly handled, but not well tested in the courts. Article 24 of Regulation (EU) 2018/1724 requires member states to have web statistics on some public services.
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