cmd/geth: export metrics to InfluxDB (#16979)

* cmd/geth: add flags for metrics export

* cmd/geth: update usage fields for metrics flags

* metrics/influxdb: update reporter logger to adhere to geth logging convention

cmd/geth/main.go

@@ -144,6 +144,15 @@ var (
 		utils.WhisperMaxMessageSizeFlag,
 		utils.WhisperMinPOWFlag,
 	}
+
+	metricsFlags = []cli.Flag{
+		utils.MetricsEnableInfluxDBFlag,
+		utils.MetricsInfluxDBEndpointFlag,
+		utils.MetricsInfluxDBDatabaseFlag,
+		utils.MetricsInfluxDBUsernameFlag,
+		utils.MetricsInfluxDBPasswordFlag,
+		utils.MetricsInfluxDBHostTagFlag,
+	}
 )
 
 func init() {
@@ -186,6 +195,7 @@ func init() {
 	app.Flags = append(app.Flags, consoleFlags...)
 	app.Flags = append(app.Flags, debug.Flags...)
 	app.Flags = append(app.Flags, whisperFlags...)
+	app.Flags = append(app.Flags, metricsFlags...)
 
 	app.Before = func(ctx *cli.Context) error {
 		runtime.GOMAXPROCS(runtime.NumCPU())
@@ -208,6 +218,9 @@ func init() {
 		log.Debug("Sanitizing Go's GC trigger", "percent", int(gogc))
 		godebug.SetGCPercent(int(gogc))
 
+		// Start metrics export if enabled
+		utils.SetupMetrics(ctx)
+
 		// Start system runtime metrics collection
 		go metrics.CollectProcessMetrics(3 * time.Second)