PromCon Europe 2023 was the eighth installment of the PromCon conference dedicated to the Prometheus monitoring system. The conference was presented as a single-track in person event with space for 300 attendees. It took place Thursday & Friday, September 28 – 29, 2023 in Berlin, Germany. PromCon aims to connect Prometheus users and developers from around the world in order to exchange knowledge, best practices, and experience gained around using Prometheus. We also want to collaborate to build a community and grow professional connections around systems and service monitoring.