Release v4.0.0 (#3141)

- bump version
- update release notes
- adjust docs
- bump pyright version
- improve unit-test coverage

tests/test_bootstrap.py

@@ -175,7 +175,7 @@ class TestBootstrap(BaseTestPostgresql):
         with patch('subprocess.call', Mock(return_value=1)):
             self.assertFalse(self.b.bootstrap({}))
 
-        config = {'users': {'replicator': {'password': 'rep-pass', 'options': ['replication']}}}
+        config = {}
 
         with patch.object(Postgresql, 'is_running', Mock(return_value=False)), \
                 patch.object(Postgresql, 'get_major_version', Mock(return_value=140000)), \
@@ -253,8 +253,12 @@ class TestBootstrap(BaseTestPostgresql):
             self.assertFalse(task.result)
 
         self.p.config._config.pop('pg_hba')
-        self.b.post_bootstrap({}, task)
-        self.assertTrue(task.result)
+        with patch('patroni.postgresql.bootstrap.logger.error', new_callable=Mock()) as mock_logger:
+            self.b.post_bootstrap({'users': 1}, task)
+            self.assertEqual(mock_logger.call_args_list[0][0][0],
+                             'User creation is not be supported starting from v4.0.0. '
+                             'Please use "boostrap.post_bootstrap" script to create users.')
+            self.assertTrue(task.result)
 
         self.b.bootstrap(config)
         with patch.object(Postgresql, 'pending_restart_reason',