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fix: configure histogram buckets for P99 latency dashboard #18

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Merged
yurushao merged 1 commit into from
Feb 21, 2026
Merged

fix: configure histogram buckets for P99 latency dashboard #18

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8 changes: 6 additions & 2 deletions src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,8 +34,12 @@ struct Args {
async fn main() {
tracing_subscriber::fmt::init();

// Initialize Prometheus recorder
let builder = PrometheusBuilder::new();
// Initialize Prometheus recorder with histogram buckets
// Using set_buckets makes the exporter emit true Prometheus histograms (_bucket/_sum/_count)
// instead of summaries, which is required for histogram_quantile() in Grafana.
let builder = PrometheusBuilder::new()
.set_buckets(&[0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0])
.expect("failed to set histogram buckets");
let handle = builder
.install_recorder()
.expect("failed to install Prometheus recorder");
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