utils prometheusmetrics: switch AddIPCnt to be a counter

go.mod

@@ -104,6 +104,7 @@ require (
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 // indirect
 	github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 // indirect
 	github.com/lib/pq v1.10.9 // indirect

pkg/ipamd/rpc_handler_test.go

@@ -22,6 +22,9 @@ import (
 
 	pb "github.com/aws/amazon-vpc-cni-k8s/rpc"
 
+	"github.com/aws/amazon-vpc-cni-k8s/utils/prometheusmetrics"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/testutil"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -238,6 +241,12 @@ func TestServer_AddNetwork(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
+			// Reset the counter for each test case
+			prometheusmetrics.AddIPCnt = prometheus.NewCounter(prometheus.CounterOpts{
+				Name: "awscni_add_ip_req_count",
+				Help: "Number of add IP address requests",
+			})
+
 			m := setup(t)
 			defer m.ctrl.Finish()
 
@@ -302,6 +311,10 @@ func TestServer_AddNetwork(t *testing.T) {
 				assert.NoError(t, err)
 				assert.Equal(t, tt.want, resp)
 			}
+
+			// Add more detailed assertion messages
+			assert.Equal(t, float64(1), testutil.ToFloat64(prometheusmetrics.AddIPCnt),
+				"AddIPCnt should be incremented exactly once for test case: %s", tt.name)
 		})
 	}
 }

utils/prometheusmetrics/prometheusmetrics.go

@@ -61,8 +61,8 @@ var (
 		},
 		[]string{"fn"},
 	)
-	AddIPCnt = prometheus.NewGauge(
-		prometheus.GaugeOpts{
+	AddIPCnt = prometheus.NewCounter(
+		prometheus.CounterOpts{
 			Name: "awscni_add_ip_req_count",
 			Help: "The number of add IP address requests",
 		},