crowdsec: remove warning if prometheus port is taken during cold logs processing (#2857)

i.e. remove a "Warning: port is already in use" because it's probably LAPI

cmd/crowdsec/crowdsec.go

@@ -280,7 +280,7 @@ func waitOnTomb() {
 		case <-acquisTomb.Dead():
 			/*if it's acquisition dying it means that we were in "cat" mode.
 			while shutting down, we need to give time for all buckets to process in flight data*/
-			log.Warning("Acquisition is finished, shutting down")
+			log.Info("Acquisition is finished, shutting down")
 			/*
 				While it might make sense to want to shut-down parser/buckets/etc. as soon as acquisition is finished,
 				we might have some pending buckets: buckets that overflowed, but whose LeakRoutine are still alive because they

cmd/crowdsec/main.go

@@ -75,6 +75,10 @@ type Flags struct {
 	CPUProfile     string
 }
 
+func (f *Flags) haveTimeMachine() bool {
+	return f.OneShotDSN != ""
+}
+
 type labelsMap map[string]string
 
 func LoadBuckets(cConfig *csconfig.Config, hub *cwhub.Hub) error {

cmd/crowdsec/metrics.go

@@ -196,6 +196,9 @@ func servePrometheus(config *csconfig.PrometheusCfg, dbClient *database.Client,
 	log.Debugf("serving metrics after %s ms", time.Since(crowdsecT0))
 
 	if err := http.ListenAndServe(fmt.Sprintf("%s:%d", config.ListenAddr, config.ListenPort), nil); err != nil {
-		log.Warningf("prometheus: %s", err)
+		// in time machine, we most likely have the LAPI using the port
+		if !flags.haveTimeMachine() {
+			log.Warningf("prometheus: %s", err)
+		}
 	}
 }