[test] Add timeout to metrics query

Prevents client.Do from blocking indefinitely.

Author: sebsoto

test/e2e/metrics_test.go

@@ -12,6 +12,7 @@ import (
 	"strconv"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -267,7 +268,7 @@ func makePrometheusQuery(address, query, token string) ([]Result, error) {
 		// InsecureSkipVerify is required to avoid errors due to bad certificate
 		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
 	}
-	client := &http.Client{Transport: tr}
+	client := &http.Client{Transport: tr, Timeout: 15 * time.Second}
 	resp, err := client.Do(req)
 	if err != nil {
 		return nil, fmt.Errorf("error making GET request: %w", err)