Revert "add prometheus substrate_process_start_time_seconds metric"

This reverts commit e84dde6.

dot/network/service.go

@@ -87,12 +87,6 @@ var (
 		Name:      "outbound_total",
 		Help:      "total number of outbound streams",
 	})
-	// TODO(ed), find better way to handle this, to actually override the default process_start_time_seconds metric
-	runningGauge = promauto.NewGauge(prometheus.GaugeOpts{
-		Namespace: "substrate",
-		Name:      "process_start_time_seconds",
-		Help:      "gossamer process start time seconds",
-	})
 )
 
 type (
@@ -358,7 +352,6 @@ func (s *Service) updateMetrics() {
 		case <-s.ctx.Done():
 			return
 		case <-ticker.C:
-			runningGauge.Set(1.5)
 			peerCountGauge.Set(float64(s.host.peerCount()))
 			connectionsGauge.Set(float64(len(s.host.p2pHost.Network().Conns())))
 			nodeLatencyGauge.Set(float64(