Function bucket_text 

pub fn bucket_text(
    rows: &[Row],
    catalog: &Catalog,
    now_ms: i64,
    lookback_ms: i64,
    size_ms: i64,
    tz_secs: i64,
    colour: bool,
    fmt: Fmt,
) -> String

AFP per bucket (day or hour), oldest first — arkuse daily / arkuse hourly.