use as_dict() because label_matcher_dict excludes unit

lib/charms/grafana_agent/v0/cos_agent.py

@@ -703,7 +703,7 @@ def metrics_jobs(self) -> List[Dict]:
                     static_config["labels"] = {
                         # Be sure to keep labels from static_config
                         **static_config.get("labels", {}),
-                        **topology.label_matcher_dict,
+                        **topology.as_dict(excluded_keys=["charm_name"]),
                     }
 
                 scrape_jobs.append(job)