set default value for log level and web address

conf/in_cluster_scrape.yaml

@@ -1,8 +1,8 @@
 global:
   scrape_interval: 15s
-  external_labels:
-    cluster: test
-    replica: 0
+  #external_labels:
+  #  cluster: test
+  #  replica: 0
 
 scrape_configs:
   - job_name: "categraf-scrape-metrics"

conf/prometheus.toml

@@ -1,7 +1,6 @@
 [prometheus]
   enable=true
-  scrape_config_file="/path/to/scrape.yaml"
-  web_address="127.0.0.1:9091"
+  scrape_config_file="/path/to/in_cluster_scrape.yaml"
   ##wal file storage path ,default ./data-agent
   # wal_storage_path="/path/to/storage"
   ##wal reserve time duration, default value is 2 hour

prometheus/prometheus.go

@@ -478,7 +478,15 @@ func Start() {
 			Registerer: prometheus.DefaultRegisterer,
 			Gatherer:   prometheus.DefaultGatherer,
 		},
-		promlogConfig: promlog.Config{},
+		promlogConfig: promlog.Config{
+			Level: &promlog.AllowedLevel{},
+		},
+	}
+
+	if coreconfig.Config.DebugMode || coreconfig.Config.TestMode {
+		cfg.promlogConfig.Level.Set("debug")
+	} else {
+		cfg.promlogConfig.Level.Set("info")
 	}
 
 	logger := promlog.New(&cfg.promlogConfig)
@@ -544,7 +552,7 @@ func Start() {
 
 	cfg.web.ListenAddress = coreconfig.Config.Prometheus.WebAddress
 	if len(cfg.web.ListenAddress) == 0 {
-		cfg.web.ListenAddress = "127.0.0.1:9091"
+		cfg.web.ListenAddress = "127.0.0.1:0"
 	}
 
 	cfg.web.ExternalURL, err = computeExternalURL(cfg.prometheusURL, cfg.web.ListenAddress)
@@ -644,7 +652,7 @@ func Start() {
 				// Don't forget to release the reloadReady channel so that waiting blocks can exit normally.
 				select {
 				case sig := <-term:
-					level.Warn(logger).Log("msg", "Received ", sig.String())
+					level.Warn(logger).Log("msg", "Received "+sig.String())
 					if sig != syscall.SIGPIPE {
 						level.Warn(logger).Log("msg", "exiting gracefully...")
 						reloadReady.Close()