It depends on what is to be analyzed.
How many requests per second are being served? How many error codes were delivered to clients? How quickly the service responded? Service logs without PII? All perfectly fine to aggregate and analyze without consent.
How long did it take x user to navigate from x screen to y screen is one of the most valuable metrics for any site, and most people consider this to require consent. Or at least it not being worth the risk to not ask.
Acting dense like this isn't productive... And literally this information would be stores as anonymous user 12345, but that still would require consent (probably, or at least arguably).