Fix metrics labels

Signed-off-by: terashima <tomoya-terashima@cybozu.co.jp>

Author: terassyi

v2/cmd/coil-egress/sub/run.go

@@ -78,7 +78,7 @@ func subMain() error {
 		}
 	}
 
-	protocols := make([]string, 0, 0)
+	protocols := make([]string, 0)
 	for protocol := range protocolMap {
 		protocols = append(protocols, protocol)
 	}

v2/pkg/metrics/egress.go

@@ -25,14 +25,14 @@ var (
 		Subsystem: "egress",
 		Name:      "nf_conntrack_entries_count",
 		Help:      "the number of entries in the nf_conntrack table",
-	}, []string{"namespace", "pod", "egress", "protocol"})
+	}, []string{"namespace", "pod", "egress"})
 
 	NfConnctackLimit = prometheus.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: constants.MetricsNS,
 		Subsystem: "egress",
 		Name:      "nf_conntrack_entries_limit",
 		Help:      "the limit of the nf_conntrack table",
-	}, []string{"namespace", "pod", "egress", "protocol"})
+	}, []string{"namespace", "pod", "egress"})
 
 	NfTableMasqueradePackets = prometheus.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: constants.MetricsNS,