fix metric sort error

prometheus/internal/metric.go

@@ -14,7 +14,9 @@
 package internal
 
 import (
+	"regexp"
 	"sort"
+	"strconv"
 
 	dto "github.com/prometheus/client_model/go"
 )
@@ -46,6 +48,21 @@ func (s MetricSorter) Swap(i, j int) {
 	s[i], s[j] = s[j], s[i]
 }
 
+func (s MetricSorter) compare(si, sj string) bool {
+	// When the number of devices exceeds two digits, a sorting error occurs.
+	// dealing with sorting problems, especially CPU sorting errors
+	re := regexp.MustCompile(`\d+$`)
+	if re.Match([]byte(si)) && re.Match([]byte(sj)) {
+		siCode := re.FindStringSubmatch(si)[0]
+		sjCode := re.FindStringSubmatch(sj)[0]
+		siValue, _ := strconv.Atoi(siCode)
+		sjValue, _ := strconv.Atoi(sjCode)
+		return siValue < sjValue
+	}
+	// Non-numeric identification device, use original sorting
+	return si < sj
+}
+
 func (s MetricSorter) Less(i, j int) bool {
 	if len(s[i].Label) != len(s[j].Label) {
 		// This should not happen. The metrics are
@@ -60,7 +77,7 @@ func (s MetricSorter) Less(i, j int) bool {
 		vi := lp.GetValue()
 		vj := s[j].Label[n].GetValue()
 		if vi != vj {
-			return vi < vj
+			return s.compare(vi, vj)
 		}
 	}
 

prometheus/internal/metric_sort_test.go

@@ -0,0 +1,67 @@
+// Copyright 2022 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package internal
+
+import (
+	"sort"
+	"strings"
+	"testing"
+
+	"github.com/prometheus/common/expfmt"
+)
+
+func BenchmarkSort(b *testing.B) {
+	var parser expfmt.TextParser
+	text := `
+	# HELP node_cpu_guest_seconds_total Seconds the CPUs spent in guests (VMs) for each mode.
+	# TYPE node_cpu_guest_seconds_total counter
+	node_cpu_guest_seconds_total{cpu="0",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="0",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="1",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="1",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="10",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="10",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="11",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="11",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="12",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="12",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="13",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="13",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="14",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="14",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="15",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="15",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="2",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="2",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="3",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="3",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="4",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="4",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="5",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="5",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="6",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="6",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="7",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="7",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="8",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="8",mode="user"} 0
+	node_cpu_guest_seconds_total{cpu="9",mode="nice"} 0
+	node_cpu_guest_seconds_total{cpu="9",mode="user"} 0
+	`
+	notNormalized, _ := parser.TextToMetricFamilies(strings.NewReader(text))
+	for i := 0; i < b.N; i++ {
+		for _, mf := range notNormalized {
+			sort.Sort(MetricSorter(mf.Metric))
+		}
+	}
+}