retrieval: handle not found error correctly

cmd/prometheus/main.go

@@ -20,6 +20,8 @@ import (
 	_ "net/http/pprof" // Comment this line to disable pprof endpoint.
 	"os"
 	"os/signal"
+	"runtime"
+	"runtime/trace"
 	"syscall"
 	"time"
 
@@ -56,10 +58,24 @@ var (
 
 func init() {
 	prometheus.MustRegister(version.NewCollector("prometheus"))
+	runtime.SetMutexProfileFraction(20)
+	runtime.SetBlockProfileRate(20)
 }
 
-// Main manages the startup and shutdown lifecycle of the entire Prometheus server.
+// Main manages the stup and shutdown lifecycle of the entire Prometheus server.
 func Main() int {
+	go func() {
+		f, err := os.Create("trace")
+		if err != nil {
+			panic(err)
+		}
+		if err := trace.Start(f); err != nil {
+			panic(err)
+		}
+		time.Sleep(30 * time.Second)
+		trace.Stop()
+		f.Close()
+	}()
 	if err := parse(os.Args[1:]); err != nil {
 		log.Error(err)
 		return 2

promql/functions.go

@@ -14,7 +14,6 @@
 package promql
 
 import (
-	"fmt"
 	"math"
 	"regexp"
 	"sort"
@@ -725,8 +724,6 @@ func funcHistogramQuantile(ev *evaluator, args Expressions) Value {
 	q := ev.evalFloat(args[0])
 	inVec := ev.evalVector(args[1])
 
-	fmt.Println("invec", inVec)
-
 	outVec := Vector{}
 	signatureToMetricWithBuckets := map[uint64]*metricWithBuckets{}
 	for _, el := range inVec {

retrieval/target.go

@@ -78,9 +78,9 @@ func NewHTTPClient(cfg config.HTTPClientConfig) (*http.Client, error) {
 	// The only timeout we care about is the configured scrape timeout.
 	// It is applied on request. So we leave out any timings here.
 	var rt http.RoundTripper = &http.Transport{
-		Proxy:             http.ProxyURL(cfg.ProxyURL.URL),
-		DisableKeepAlives: true,
-		TLSClientConfig:   tlsConfig,
+		Proxy:           http.ProxyURL(cfg.ProxyURL.URL),
+		MaxIdleConns:    10000,
+		TLSClientConfig: tlsConfig,
 	}
 
 	// If a bearer token is provided, create a round tripper that will set the