update error log to odoo12

It actually depends on postgresql and python lib, rather than odoo version. But odoo version is all I know for sure

docs/admin/db_maxconn.rst

@@ -25,27 +25,61 @@ More accurate explanantion of this option is as following:
 
 If you have deployment with big number of databases or simultaneous users you may face following error::
 
-    2017-09-11 14:01:14,876 8676 ERROR ? odoo.service.server: Worker (8676) Exception occured, exiting...
-    Traceback (most recent call last):
-      File "/opt/odoo/10/odoo/service/server.py", line 721, in run
-        self.process_work()
-      File "/opt/odoo/10/odoo/service/server.py", line 791, in process_work
-        db_names = self._db_list()
-      File "/opt/odoo/10/odoo/service/server.py", line 784, in _db_list
-        db_names = odoo.service.db.list_dbs(True)
-      File "/opt/odoo/10/odoo/service/db.py", line 325, in list_dbs
+    File "/opt/odoo/vendor/odoo/cc/odoo/service/wsgi_server.py", line 128, in application
+        return application_unproxied(environ, start_response)
+    File "/opt/odoo/vendor/odoo/cc/odoo/service/wsgi_server.py", line 117, in application_unproxied
+        result = odoo.http.root(environ, start_response)
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 1331, in __call__
+        return self.dispatch(environ, start_response)
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 1300, in __call__
+        return self.app(environ, start_wrapped)
+    File "/opt/odoo/.local/lib/python3.7/site-packages/werkzeug/wsgi.py", line 766, in __call__
+        return self.app(environ, start_response)
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 1501, in dispatch
+        result = ir_http._dispatch()
+    File "/opt/odoo/vendor/odoo/cc/addons/auth_signup/models/ir_http.py", line 19, in _dispatch
+        return super(Http, cls)._dispatch()
+    File "/opt/odoo/vendor/odoo/cc/addons/web_editor/models/ir_http.py", line 22, in _dispatch
+        return super(IrHttp, cls)._dispatch()
+    File "/opt/odoo/vendor/odoo/cc/odoo/addons/base/models/ir_http.py", line 207, in _dispatch
+        return cls._handle_exception(e)
+    File "/opt/odoo/vendor/odoo/cc/odoo/addons/base/models/ir_http.py", line 174, in _handle_exception
+        raise exception
+    File "/opt/odoo/vendor/odoo/cc/odoo/addons/base/models/ir_http.py", line 203, in _dispatch
+        result = request.dispatch()
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 840, in dispatch
+        r = self._call_function(**self.params)
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 351, in _call_function
+        return checked_call(self.db, *args, **kwargs)
+    File "/opt/odoo/vendor/odoo/cc/odoo/service/model.py", line 97, in wrapper
+        return f(dbname, *args, **kwargs)
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 344, in checked_call
+        result = self.endpoint(*a, **kw)
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 946, in __call__
+        return self.method(*args, **kw)
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 524, in response_wrap
+        response = f(*args, **kw)
+    File "/opt/odoo/vendor/odoo/cc/addons/auth_signup/controllers/main.py", line 21, in web_login
+        response = super(AuthSignupHome, self).web_login(*args, **kw)
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 524, in response_wrap
+        response = f(*args, **kw)
+    File "/opt/odoo/vendor/odoo/cc/addons/web/controllers/main.py", line 484, in web_login
+        values['databases'] = http.db_list()
+    File "/opt/odoo/vendor/odoo/cc/odoo/http.py", line 1517, in db_list
+        dbs = odoo.service.db.list_dbs(force)
+    File "/opt/odoo/vendor/odoo/cc/odoo/service/db.py", line 379, in list_dbs
         with closing(db.cursor()) as cr:
-      File "/opt/odoo/10/odoo/sql_db.py", line 622, in cursor
+    File "/opt/odoo/vendor/odoo/cc/odoo/sql_db.py", line 657, in cursor
         return Cursor(self.__pool, self.dbname, self.dsn, serialized=serialized)
-      File "/opt/odoo/10/odoo/sql_db.py", line 164, in __init__
+    File "/opt/odoo/vendor/odoo/cc/odoo/sql_db.py", line 171, in __init__
         self._cnx = pool.borrow(dsn)
-      File "/opt/odoo/10/odoo/sql_db.py", line 505, in _locked
+    File "/opt/odoo/vendor/odoo/cc/odoo/sql_db.py", line 540, in _locked
         return fun(self, *args, **kwargs)
-      File "/opt/odoo/10/odoo/sql_db.py", line 573, in borrow
+    File "/opt/odoo/vendor/odoo/cc/odoo/sql_db.py", line 608, in borrow
         **connection_info)
-      File "/usr/local/lib/python2.7/dist-packages/psycopg2/__init__.py", line 164, in connect
-        conn = _connect(dsn, connection_factory=connection_factory, async=async)
-    OperationalError: FATAL:  remaining connection slots are reserved for non-replication superuser connections
+    File "/usr/local/lib/python3.7/site-packages/psycopg2/__init__.py", line 130, in connect
+        conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
+    psycopg2.OperationalError: FATAL: sorry, too many clients already
 
 
 To resolve it you need configure following parameters: