normalize latency in ms (#5783)

proxyd/backend.go

@@ -482,7 +482,7 @@ func (b *Backend) doForward(ctx context.Context, rpcReqs []*RPCReq, isBatch bool
 	}
 	duration := time.Since(start)
 	b.latencySlidingWindow.Add(float64(duration))
-	RecordBackendNetworkLatencyAverageSlidingWindow(b, b.latencySlidingWindow.Avg())
+	RecordBackendNetworkLatencyAverageSlidingWindow(b, time.Duration(b.latencySlidingWindow.Avg()))
 
 	sortBatchRPCResponse(rpcReqs, res)
 	return res, nil

proxyd/metrics.go

@@ -442,8 +442,8 @@ func RecordConsensusBackendUpdateDelay(b *Backend, delay time.Duration) {
 	consensusUpdateDelayBackend.WithLabelValues(b.Name).Set(float64(delay.Milliseconds()))
 }
 
-func RecordBackendNetworkLatencyAverageSlidingWindow(b *Backend, avgLatency float64) {
-	avgLatencyBackend.WithLabelValues(b.Name).Set(avgLatency)
+func RecordBackendNetworkLatencyAverageSlidingWindow(b *Backend, avgLatency time.Duration) {
+	avgLatencyBackend.WithLabelValues(b.Name).Set(float64(avgLatency.Milliseconds()))
 }
 
 func RecordBackendNetworkRequestCountSlidingWindow(b *Backend, count uint) {