fn prometheus_stats()

in src/core/admin/src/lib.rs [559:602]

• 42 lines of code
• 6 McCabe index (conditional complexity)

    fn prometheus_stats(&self) -> String {
        let mut data = Vec::new();

        for metric in &rustcommon_metrics::metrics() {
            let any = match metric.as_any() {
                Some(any) => any,
                None => {
                    continue;
                }
            };

            if let Some(counter) = any.downcast_ref::<Counter>() {
                data.push(format!(
                    "# TYPE {} counter\n{} {}",
                    metric.name(),
                    metric.name(),
                    counter.value()
                ));
            } else if let Some(gauge) = any.downcast_ref::<Gauge>() {
                data.push(format!(
                    "# TYPE {} gauge\n{} {}",
                    metric.name(),
                    metric.name(),
                    gauge.value()
                ));
            } else if let Some(heatmap) = any.downcast_ref::<Heatmap>() {
                for (label, value) in PERCENTILES {
                    let percentile = heatmap.percentile(*value).map(|b| b.high()).unwrap_or(0);
                    data.push(format!(
                        "# TYPE {} gauge\n{}{{percentile=\"{}\"}} {}",
                        metric.name(),
                        metric.name(),
                        label,
                        percentile
                    ));
                }
            }
        }
        data.sort();
        let mut content = data.join("\n");
        content += "\n";
        let parts: Vec<&str> = content.split('/').collect();
        parts.join("_")
    }