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rpc: swap out timer metrics to histograms #25044

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Merged
merged 1 commit into from
Jun 8, 2022
Merged

rpc: swap out timer metrics to histograms #25044

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2 changes: 1 addition & 1 deletion rpc/handler.go
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Original file line number Diff line number Diff line change
Expand Up @@ -346,7 +346,7 @@ func (h *handler) handleCall(cp *callProc, msg *jsonrpcMessage) *jsonrpcMessage
successfulRequestGauge.Inc(1)
}
rpcServingTimer.UpdateSince(start)
newRPCServingTimer(msg.Method, answer.Error == nil).UpdateSince(start)
updateServeTimeHistogram(msg.Method, answer.Error == nil, time.Since(start))
}
return answer
}
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25 changes: 18 additions & 7 deletions rpc/metrics.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ package rpc

import (
"fmt"
"time"

"github.com/ethereum/go-ethereum/metrics"
)
Expand All @@ -26,14 +27,24 @@ var (
rpcRequestGauge = metrics.NewRegisteredGauge("rpc/requests", nil)
successfulRequestGauge = metrics.NewRegisteredGauge("rpc/success", nil)
failedRequestGauge = metrics.NewRegisteredGauge("rpc/failure", nil)
rpcServingTimer = metrics.NewRegisteredTimer("rpc/duration/all", nil)

// serveTimeHistName is the prefix of the per-request serving time histograms.
serveTimeHistName = "rpc/duration"

rpcServingTimer = metrics.NewRegisteredTimer("rpc/duration/all", nil)
)

func newRPCServingTimer(method string, valid bool) metrics.Timer {
flag := "success"
if !valid {
flag = "failure"
// updateServeTimeHistogram tracks the serving time of a remote RPC call.
func updateServeTimeHistogram(method string, success bool, elapsed time.Duration) {
note := "success"
if !success {
note = "failure"
}
h := fmt.Sprintf("%s/%s/%s", serveTimeHistName, method, note)
sampler := func() metrics.Sample {
return metrics.ResettingSample(
metrics.NewExpDecaySample(1028, 0.015),
)
}
m := fmt.Sprintf("rpc/duration/%s/%s", method, flag)
return metrics.GetOrRegisterTimer(m, nil)
metrics.GetOrRegisterHistogramLazy(h, nil, sampler).Update(elapsed.Microseconds())
}