Remove fetch server, add monitor callback

main.go

@@ -65,12 +65,12 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-	if err := fetcher.Start(); err != nil {
-		panic(err)
-	}
-	defer fetcher.Stop()
 
-	mon, err := monitor.New(config.MonitorPort)
+	mon, err := monitor.New(config.MonitorPort, func(url string) {
+		if err := fetcher.FetchProcess(url); err != nil {
+			logger.Logf("error fetching %q: %v", url, err)
+		}
+	})
 	if err != nil {
 		panic(err)
 	}