NFSd: fix nfsd v4 index miss (prometheus#2824)

* fix nfsd v4 index miss

---------

Signed-off-by: dongjiang1989 <dongjiang1989@126.com>

Author: dongjiang1989

collector/fixtures/e2e-64k-page-output.txt

@@ -2738,6 +2738,8 @@ node_nfsd_requests_total{method="SecInfo",proto="4"} 0
 node_nfsd_requests_total{method="SetAttr",proto="2"} 0
 node_nfsd_requests_total{method="SetAttr",proto="3"} 0
 node_nfsd_requests_total{method="SetAttr",proto="4"} 0
+node_nfsd_requests_total{method="SetClientID",proto="4"} 3
+node_nfsd_requests_total{method="SetClientIDConfirm",proto="4"} 3
 node_nfsd_requests_total{method="SymLink",proto="2"} 0
 node_nfsd_requests_total{method="SymLink",proto="3"} 0
 node_nfsd_requests_total{method="Verify",proto="4"} 0

collector/fixtures/e2e-output.txt

@@ -3029,6 +3029,8 @@ node_nfsd_requests_total{method="SecInfo",proto="4"} 0
 node_nfsd_requests_total{method="SetAttr",proto="2"} 0
 node_nfsd_requests_total{method="SetAttr",proto="3"} 0
 node_nfsd_requests_total{method="SetAttr",proto="4"} 0
+node_nfsd_requests_total{method="SetClientID",proto="4"} 3
+node_nfsd_requests_total{method="SetClientIDConfirm",proto="4"} 3
 node_nfsd_requests_total{method="SymLink",proto="2"} 0
 node_nfsd_requests_total{method="SymLink",proto="3"} 0
 node_nfsd_requests_total{method="Verify",proto="4"} 0

collector/nfsd_linux.go

@@ -395,6 +395,10 @@ func (c *nfsdCollector) updateNFSdRequestsv4Stats(ch chan<- prometheus.Metric, s
 		float64(s.SecInfo), proto, "SecInfo")
 	ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
 		float64(s.SetAttr), proto, "SetAttr")
+	ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
+		float64(s.SetClientID), proto, "SetClientID")
+	ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
+		float64(s.SetClientIDConfirm), proto, "SetClientIDConfirm")
 	ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
 		float64(s.Verify), proto, "Verify")
 	ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,