change percentiles

prober/http.go

@@ -34,7 +34,7 @@ var (
 		prometheus.HistogramOpts{
 			Name:    "health_http_dns_lookup_time_seconds",
 			Help:    "The response time of dns lookup",
-			Buckets: []float64{0.001, 0.005, 0.01, 0.02, 0.03, 0.05, 0.075, 0.1, 0.2, 0.5, 0.75, 1, 1.5, 2, 2.5, 3, 4, 5},
+			Buckets: []float64{0.0005, 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.008, 0.01, 0.015, 0.02, 0.03, 0.05, 0.075, 0.1, 0.2, 0.5, 1},
 		},
 		[]string{"name", "status_code", "dns_error", "result", "url"},
 	)
@@ -144,16 +144,18 @@ func (h *HTTP) calculateInterval() time.Duration {
 func (h *HTTP) sendRequest(ctx context.Context) HTTPResult {
 	var startTime time.Time
 	var dnsStartTime time.Time
-	var dnsDoneTime time.Time
+	var dnsLookupTime float64
 	var dnsError string
+	var dnsHost string
 	httpTrace := &httptrace.ClientTrace{
-		DNSStart: func(_ httptrace.DNSStartInfo) {
+		DNSStart: func(info httptrace.DNSStartInfo) {
+			dnsHost = info.Host
 			dnsStartTime = time.Now()
 		},
 		DNSDone: func(info httptrace.DNSDoneInfo) {
-			dnsDoneTime = time.Now()
+			dnsLookupTime = time.Since(dnsStartTime).Seconds()
 			if info.Err != nil {
-				klog.Infof("DNS Error: %v ", info.Err)
+				klog.Infof("DNS Error for %v in %v seconds: %v ", dnsHost, dnsLookupTime, info.Err)
 				dnsError = info.Err.Error()
 			}
 		},
@@ -167,7 +169,6 @@ func (h *HTTP) sendRequest(ctx context.Context) HTTPResult {
 	startTime = time.Now()
 	res, err := h.Client.Do(req)
 	responseTime := time.Since(startTime).Seconds()
-	dnsLookupTime := dnsDoneTime.Sub(dnsStartTime).Seconds()
 
 	if err != nil {
 		return HTTPResult{