*: update client-go and fix metrics (pingcap#29354)

go.mod

@@ -65,7 +65,7 @@ require (
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.7.0
 	github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2
-	github.com/tikv/client-go/v2 v2.0.0-alpha.0.20211101035952-9ec50224bea6
+	github.com/tikv/client-go/v2 v2.0.0-alpha.0.20211102120533-b8cc5a319d96
 	github.com/tikv/pd v1.1.0-beta.0.20211029083450-e65f0c55b6ae
 	github.com/twmb/murmur3 v1.1.3
 	github.com/uber/jaeger-client-go v2.22.1+incompatible

go.sum

@@ -712,8 +712,8 @@ github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2/go.mod h1:2PfK
 github.com/tidwall/gjson v1.3.5/go.mod h1:P256ACg0Mn+j1RXIDXoss50DeIABTYK1PULOJHhxOls=
 github.com/tidwall/match v1.0.1/go.mod h1:LujAq0jyVjBy028G1WhWfIzbpQfMO8bBZ6Tyb0+pL9E=
 github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
-github.com/tikv/client-go/v2 v2.0.0-alpha.0.20211101035952-9ec50224bea6 h1:hRn82rVDw91KBSoMT7eAv8qPIxFMU6+f5K35fP5ULbY=
-github.com/tikv/client-go/v2 v2.0.0-alpha.0.20211101035952-9ec50224bea6/go.mod h1:iiwtsCxcbNLK5i9VRYGvdcihgHXTKy2ukWjoaJsrphg=
+github.com/tikv/client-go/v2 v2.0.0-alpha.0.20211102120533-b8cc5a319d96 h1:+PffHhOZm7OpC+VrL10ahT/KwloECT4ZtSJ0D8SzmYQ=
+github.com/tikv/client-go/v2 v2.0.0-alpha.0.20211102120533-b8cc5a319d96/go.mod h1:iiwtsCxcbNLK5i9VRYGvdcihgHXTKy2ukWjoaJsrphg=
 github.com/tikv/pd v1.1.0-beta.0.20211029083450-e65f0c55b6ae h1:PmnkhiOopgMZYDQ7Htj1kt/zwW4MEOUL+Dem6WLZISY=
 github.com/tikv/pd v1.1.0-beta.0.20211029083450-e65f0c55b6ae/go.mod h1:varH0IE0jJ9E9WN2Ei/N6pajMlPkcXdDEf7f5mmsUVQ=
 github.com/tklauser/go-sysconf v0.3.4 h1:HT8SVixZd3IzLdfs/xlpq0jeSfTX57g1v6wB1EuzV7M=

store/copr/coprocessor.go

@@ -723,6 +723,7 @@ func (worker *copIteratorWorker) handleTaskOnce(bo *Backoffer, task *copTask, ch
 	if worker.req.IsStaleness {
 		req.EnableStaleRead()
 	}
+	staleRead := req.GetStaleRead()
 	ops := make([]tikv.StoreSelectorOption, 0, 2)
 	if len(worker.req.MatchStoreLabels) > 0 {
 		ops = append(ops, tikv.WithMatchLabels(worker.req.MatchStoreLabels))
@@ -744,8 +745,7 @@ func (worker *copIteratorWorker) handleTaskOnce(bo *Backoffer, task *copTask, ch
 		worker.logTimeCopTask(costTime, task, bo, resp)
 	}
 	storeID := strconv.FormatUint(req.Context.GetPeer().GetStoreId(), 10)
-	staleRead := strconv.FormatBool(req.StaleRead)
-	metrics.TiKVCoprocessorHistogram.WithLabelValues(storeID, staleRead).Observe(costTime.Seconds())
+	metrics.TiKVCoprocessorHistogram.WithLabelValues(storeID, strconv.FormatBool(staleRead)).Observe(costTime.Seconds())
 
 	if task.cmdType == tikvrpc.CmdCopStream {
 		return worker.handleCopStreamResult(bo, rpcCtx, resp.Resp.(*tikvrpc.CopStreamResponse), task, ch, costTime)