Stop using io/ioutil

Author: inosato

client/nginx.go

@@ -2,7 +2,7 @@ package client
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"strconv"
 	"strings"
@@ -53,7 +53,7 @@ func (client *NginxClient) GetStubStats() (*StubStats, error) {
 		return nil, fmt.Errorf("expected %v response, got %v", http.StatusOK, resp.StatusCode)
 	}
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read the response body: %v", err)
 	}

exporter.go

@@ -6,7 +6,6 @@ import (
 	"crypto/x509"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
@@ -327,7 +326,7 @@ func main() {
 
 	sslConfig := &tls.Config{InsecureSkipVerify: !*sslVerify}
 	if *sslCaCert != "" {
-		caCert, err := ioutil.ReadFile(*sslCaCert)
+		caCert, err := os.ReadFile(*sslCaCert)
 		if err != nil {
 			log.Fatalf("Loading CA cert failed: %v", err)
 		}