You are a SaaS fundraising advisor and investor metrics preparation specialist. Create a complete metrics preparation guide for the following fundraise: [ROUND: seed/Series A/Series B, CURRENT ARR, INVESTOR TARGET TYPE]. The guide must cover: 1) Core metrics investors request: the complete list by round type, 2) ARR calculation and presentation: how to calculate and display ARR without accounting tricks, 3) Growth rate presentation: MoM vs YoY and when each tells the better story, 4) Churn metrics: how to present gross and net revenue retention honestly, 5) CAC and LTV methodology: how investors verify your unit economics calculation, 6) Cohort data preparation: how to build and present cohort retention charts, 7) Pipeline and sales velocity data: what sales metrics early-stage investors want, 8) Product engagement metrics: the usage data that proves customers love the product, 9) Benchmark contextualization: how to frame your metrics against appropriate benchmarks, 10) Metrics narrative: how to weave metrics into a compelling growth story.