October 27 is celebrated as Prometheus Day during ObservabilityCON, an online conference focused on metrics-based monitoring systems, particularly Prometheus and its ecosystem. The day features various speakers such as Grofers’ Vaibhav Krishna, who discusses integrating Loki with Prometheus and Grafana, and Bartek Plotka from RedHat and Frederic Branczyk, who introduce ConProf, a profiling tool akin to Prometheus. Krisztian Fekete from LogMeIn shares insights on LastPass's observability infrastructure, highlighting the use of Istio service mesh with Prometheus and Jaeger. Grafana Labs' team members, including intern Atibhi Agrawal and Cortex maintainer Marco Pracucci, present developments like data backfill in Prometheus and scalable shuffle sharding in Cortex. New UI features in Grafana Cloud are demonstrated by Jess Müller and Teddy Bartha, while Alex Martin discusses Grafana Metrics Enterprise's role in helping large organizations adopt Prometheus. The event is hosted by Anthony Woods, Grafana Labs' CTO and cofounder, who will also present Prometheus adoption trends, encouraging attendees to register for the event.