removed default config and set as example + removed bad verification …

…of len of metrics

config/config.go

@@ -82,9 +82,6 @@ func WriteFile(filename string, content []byte) error {
 }
 
 func (mm MetricsConfig) validate() error {
-	if len(mm.Metrics) == 0 {
-		return errors.New("missing field 'metrics' in top configuration")
-	}
 	for i, m := range mm.Metrics {
 		if m.Name == "" {
 			return errors.New("missing field 'name' in 'metrics' configuration of metric " + fmt.Sprint(i))

examples/opcua.yaml

@@ -0,0 +1,13 @@
+metrics:
+  - name: Temperature   # MANDATORY
+    help: get metrics for machine temperature # MANDATORY
+    nodeid: ns=2;i=10853 # MANDATORY and UNIQUE for each metric
+    labels: # if metrics share the same name they can be distinguis by labels
+      site: MLK
+    type: gauge # MANDATORY metric type can be counter, gauge, Float, Double
+  - name: Temperature
+    help: get metrics for machine temperature
+    nodeid: ns=2;i=10852
+    labels:
+      site: Paris
+    type: gauge

opcua.yaml

@@ -1,13 +1 @@
-metrics:
-  - name: Temperature   # MANDATORY
-    help: get metrics for machine temperature # MANDATORY
-    nodeid: ns=2;i=10853 # MANDATORY and UNIQUE for each metric
-    labels: # if metrics share the same name they can be distinguis by labels
-      site: MLK
-    type: gauge # MANDATORY metric type can be counter, gauge, Float, Double
-  - name: Temperature
-    help: get metrics for machine temperature
-    nodeid: ns=2;i=10852
-    labels: 
-      site: Paris
-    type: gauge
+metrics: []