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POV) You use Windows 11 and set up Pihole for the first time.
(sh.itjust.works)
This is a most excellent place for technology news and articles.
While telemetry is bad the problem here is probably that this windows service pings the server but doesn't get a response because it got stuck in your pihole. So it tries to pings again and again and again and again...
The best solution would be to disable telemetry to the capacity you are capable or is possible without breaking something and block pings as backup to when it's enabled again with updates and repeat.