Add health status metrics for label selector types

This commit adds support for getting health metrics for load balancers with “label” targets.

In load balancers with label selector target types, the API will report the health status of each selected server in a “targets” attribute (load_balancer.targets.targets).

code/exporter.py

@@ -203,7 +203,15 @@ def get_metrics(metrics_type, lbid):
                                 hetzner_load_balancer_name=lb_name).set(get_metrics('bandwidth',load_balancer_id)["metrics"]["time_series"]["bandwidth.out"]["values"][0][1])
 
             lb_info = get_load_balancer_info(load_balancer_id)['load_balancer']
-            for target in [x for x in lb_info['targets'] if x['type'] == 'server']:
+
+            targets = []
+            for x in lb_info['targets']:
+                if x['type'] == 'server':
+                    targets.append(x)
+                elif x['type'] == 'label_selector':
+                    targets.extend(x['targets'])
+
+            for target in targets:
                 for health_status in target['health_status']:
                     hetzner_service_state.labels(hetzner_load_balancer_id=load_balancer_id,
                                                  hetzner_load_balancer_name=lb_name,