The document presents insights from a study on collection development librarians' familiarity and use of metrics, including traditional metrics and altmetrics, based on a survey of 707 respondents from R1 institutions in the US. Key findings indicate that familiarity with metrics does not correlate with years of experience, but tenure status affects familiarity with traditional metrics, while altmetrics familiarity remains unaffected. The study concludes that traditional metrics are more frequently used for collection development, with plans for further research on the international scale and the impact of open access on altmetrics.