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fix(kms-connector): add prometheus content-type header #1762

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Merged
eudelins-zama merged 1 commit into from
Jan 9, 2026
Merged

fix(kms-connector): add prometheus content-type header #1762

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13 changes: 10 additions & 3 deletions kms-connector/crates/utils/src/monitoring/otlp.rs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
use actix_web::{HttpResponse, http::StatusCode};
use actix_web::HttpResponse;
use anyhow::anyhow;
use opentelemetry::{
global,
Expand Down Expand Up @@ -51,13 +51,20 @@ pub fn init_otlp_setup(service_name: String) -> anyhow::Result<()> {
Ok(())
}

/// The content type header for Prometheus text-based metrics format.
///
/// For more details, check https://prometheus.io/docs/instrumenting/exposition_formats/#text-based-format
const PROMETHEUS_TEXT_FORMAT_HEADER: (&str, &str) = ("Content-Type", prometheus::TEXT_FORMAT);

/// Responder used to collect metrics of the service.
pub async fn metrics_responder() -> impl actix_web::Responder {
let encoder = prometheus::TextEncoder::new();
let metric_families = prometheus::gather();
match encoder.encode_to_string(&metric_families) {
Ok(encoded_metrics) => HttpResponse::with_body(StatusCode::OK, encoded_metrics),
Err(e) => HttpResponse::with_body(StatusCode::INTERNAL_SERVER_ERROR, e.to_string()),
Ok(encoded_metrics) => HttpResponse::Ok()
.insert_header(PROMETHEUS_TEXT_FORMAT_HEADER)
.body(encoded_metrics),
Err(e) => HttpResponse::InternalServerError().body(e.to_string()),
}
}

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