chore: revert "Merge pull request #101 from Abuelodelanada/feature/observability"

This reverts commit 95d29e5, reversing
changes made to abb5f63.

Author: wallyworld

src/charm.py

@@ -99,7 +99,7 @@ def _on_metrics_endpoint_relation_created(self, event: ops.RelationJoinedEvent):
                     "password": password,
                 },
                 "tls_config": {
-                    "ca": self.ca_cert(),
+                    "ca_file": self.ca_cert(),
                     "server_name": "juju-apiserver",
                 },
             }],

tests/test_charm.py

@@ -102,7 +102,7 @@ def test_metrics_endpoint_relation(self, mock_remove_user, mock_add_user,
                     "password": 'passwd',
                 },
                 "tls_config": {
-                    "ca": 'fake',
+                    "ca-file": 'fake',
                     "server_name": "juju-apiserver",
                 },
             }],