servers: advertise the configured metricsPort to the master

Filer, S3 and broker report it on the KeepConnected registration, volume
servers in their heartbeat, and masters return their own in
GetMasterConfiguration. MasterClient gains SetMetricsPort so the eight
callers that have no metrics listener are untouched, and the volume
server takes it as a constructor argument because its heartbeat goroutine
starts there.

In combined "weed server" one metrics listener serves the whole shared
registry, so every component advertises the same port.

weed/command/filer.go

@@ -380,6 +380,7 @@ func (fo *FilerOptions) startFiler() {
 
 	fs, nfs_err := weed_server.NewFilerServer(defaultMux, publicVolumeMux, &weed_server.FilerOption{
 		Masters:                   fo.masters,
+		MetricsPort:               uint32(*fo.metricsHttpPort),
 		FilerGroup:                *fo.filerGroup,
 		Collection:                *fo.collection,
 		DefaultReplication:        *fo.defaultReplicaPlacement,

weed/command/master.go

@@ -479,6 +479,7 @@ func (m *MasterOptions) toMasterOption(whiteList []string) *weed_server.MasterOp
 		WhiteList:               whiteList,
 		DisableHttp:             *m.disableHttp,
 		MetricsAddress:          *m.metricsAddress,
+		MetricsPort:             *m.metricsHttpPort,
 		MetricsIntervalSec:      *m.metricsIntervalSec,
 		TelemetryUrl:            *m.telemetryUrl,
 		TelemetryEnabled:        *m.telemetryEnabled,

weed/command/s3.go

@@ -358,6 +358,7 @@ func (s3opt *S3Options) startS3Server() bool {
 		Filers:                    filerAddresses,
 		Masters:                   masterAddresses,
 		Port:                      *s3opt.port,
+		MetricsPort:               uint32(*s3opt.metricsHttpPort),
 		Config:                    *s3opt.config,
 		DomainName:                *s3opt.domainName,
 		AllowedOrigins:            strings.Split(*s3opt.allowedOrigins, ","),

weed/command/server.go

@@ -343,6 +343,15 @@ func runServer(cmd *Command, args []string) bool {
 	webdavOptions.filer = &filerAddress
 	mqBrokerOptions.filerGroup = filerOptions.filerGroup
 
+	// One process, one shared Prometheus registry, so a single metrics listener
+	// serves master, volume, filer and S3 series. Every component advertises
+	// that same port; the admin server deduplicates targets by address and
+	// attributes series by metric name.
+	masterOptions.metricsHttpPort = serverMetricsHttpPort
+	serverOptions.v.metricsHttpPort = serverMetricsHttpPort
+	filerOptions.metricsHttpPort = serverMetricsHttpPort
+	s3Options.metricsHttpPort = serverMetricsHttpPort
+
 	go stats_collect.StartMetricsServer(*serverMetricsHttpIp, *serverMetricsHttpPort)
 
 	*volumeDataFolders = util.ResolveCommaSeparatedPaths(*volumeDataFolders)

weed/command/volume.go

@@ -438,7 +438,7 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 		RecoveryCoef: *v.diskRecoveryCoef,
 	}
 	volumeServer := weed_server.NewVolumeServer(volumeMux, publicVolumeMux,
-		*v.ip, *v.port, *v.portGrpc, *v.publicUrl, volumeServerId,
+		*v.ip, *v.port, *v.portGrpc, *v.metricsHttpPort, *v.publicUrl, volumeServerId,
 		v.folders, v.folderMaxLimits, minFreeSpaces, diskTypes, folderTags,
 		util.ResolvePath(*v.idxFolder),
 		volumeNeedleMapKind,