feat(xPrometheus): added header

configs/nri-prometheus-config.yml.sample

@@ -27,6 +27,7 @@ integrations:
       audit: false
 
       # The HTTP client timeout when fetching data from endpoints. Defaults to "5s" if it is not set.
+      # This timeout in seconds is passed as well as a X-Prometheus-Scrape-Timeout-Seconds header to the exporters
       # scrape_timeout: "5s"
 
       # Length in time to distribute the scraping from the endpoints. Default to "30s" if it is not set.

internal/pkg/prometheus/prometheus.go

@@ -37,8 +37,8 @@ func ResetTargetSize() {
 }
 
 const (
-	// XPrometheusHeader included in all requests. It informs exporters about its timeout.
-	XPrometheusHeader = "X-Prometheus-Scrape-Timeout-Seconds"
+	// XPrometheusScrapeTimeoutHeader included in all requests. It informs exporters about its timeout.
+	XPrometheusScrapeTimeoutHeader = "X-Prometheus-Scrape-Timeout-Seconds"
 	// AcceptHeader included in all requests
 	AcceptHeader = "Accept"
 )
@@ -52,7 +52,7 @@ func Get(client HTTPDoer, url string, acceptHeader string, fetchTimeout string)
 	}
 
 	req.Header.Add(AcceptHeader, acceptHeader)
-	req.Header.Add(XPrometheusHeader, fetchTimeout)
+	req.Header.Add(XPrometheusScrapeTimeoutHeader, fetchTimeout)
 
 	resp, err := client.Do(req)
 	if err != nil {

internal/pkg/prometheus/prometheus_test.go

@@ -23,7 +23,7 @@ func TestGetHeader(t *testing.T) {
 			t.Errorf("Expected Accept header %s, got %q", testHeader, accept)
 		}
 
-		xPrometheus := r.Header.Get(prometheus.XPrometheusHeader)
+		xPrometheus := r.Header.Get(prometheus.XPrometheusScrapeTimeoutHeader)
 		if xPrometheus != fetchTimeout {
 			t.Errorf("Expected xPrometheus header %s, got %q", xPrometheus, fetchTimeout)
 		}