Histograms have significantly impacted the monitoring of time series in Prometheus by addressing limitations of earlier methods like summaries with precalculated quantiles, which were inflexible and couldn't be aggregated across various dimensions. Björn Rabenstein's trilogy of talks, including presentations at PromCon EU 2019 and FOSDEM 2020, explores the evolution and challenges of histograms within Prometheus. While histograms resolved many issues inherent in earlier designs, some challenges remain due to historical design decisions that, despite creating issues for histograms, contributed to Prometheus's overall success. The talks also highlight the influence of Prometheus's text format, improvements in its v2 release, and standardization efforts like OpenMetrics. Rabenstein plans to present further advancements in histograms at the postponed KubeCon + CloudNativeCon Europe 2020, promising additional insights from ongoing research.