PromCon 2019, the fourth annual conference dedicated to Prometheus, will occur in Munich on November 7 and 8, gathering 220 registered attendees to explore various aspects of the open-source monitoring system. Key presentations by Grafana Labs team members include discussions on scaling Prometheus with CNCF projects Cortex and Thanos, leveraging Prometheus with Jaeger for distributed tracing, advancements in the Prometheus storage engine TSDB, and the evolution of Prometheus histograms. Presenters aim to elucidate the tradeoffs, strengths, and innovations in these areas, providing insights for organizations using Prometheus. Those unable to attend can look forward to event recaps on the Grafana Labs blog, and interested parties are encouraged to arrange meetings to explore Grafana Labs' support for Prometheus, including on-premise deployments and the Grafana Cloud Hosted Prometheus service.