Ensure metric url not set until service is fully configured

src/reactive/gnocchi_handlers.py

@@ -76,6 +76,7 @@ def storage_ceph_disconnected():
 
 
 @reactive.when('metric-service.connected')
+@reactive.when('config.rendered')
 def provide_gnocchi_url(metric_service):
     with charm.provide_charm_instance() as charm_class:
         metric_service.set_gnocchi_url(charm_class.public_url)

unit_tests/test_gnocchi_handlers.py

@@ -48,6 +48,7 @@ class TestRegisteredHooks(test_utils.TestRegisteredHooks):
                 ),
                 'provide_gnocchi_url': (
                     'metric-service.connected',
+                    'config.rendered',
                 ),
                 'configure_ceph': (
                     'storage-ceph.available',