diff --git a/rhodecode/api/__init__.py b/rhodecode/api/__init__.py
--- a/rhodecode/api/__init__.py
+++ b/rhodecode/api/__init__.py
@@ -204,7 +204,7 @@ def request_view(request):
                 message='Request from IP:%s not allowed' % (
                     request.rpc_ip_addr,))
         else:
-            log.info('Access for IP:%s allowed' % (request.rpc_ip_addr,))
+            log.info('Access for IP:%s allowed', request.rpc_ip_addr)
 
         # register our auth-user
         request.rpc_user = auth_u
@@ -352,8 +352,7 @@ def setup_request(request):
         request.rpc_params = json_body['args'] \
             if isinstance(json_body['args'], dict) else {}
 
-        log.debug(
-            'method: %s, params: %s' % (request.rpc_method, request.rpc_params))
+        log.debug('method: %s, params: %s', request.rpc_method, request.rpc_params)
     except KeyError as e:
         raise JSONRPCError('Incorrect JSON data. Missing %s' % e)
 
diff --git a/rhodecode/apps/gist/views.py b/rhodecode/apps/gist/views.py
--- a/rhodecode/apps/gist/views.py
+++ b/rhodecode/apps/gist/views.py
@@ -405,8 +405,8 @@ class GistView(BaseAppView):
         revision = self.request.GET.get('revision')
 
         if revision != last_rev.raw_id:
-            log.error('Last revision %s is different then submitted %s'
-                      % (revision, last_rev))
+            log.error('Last revision %s is different then submitted %s',
+                      revision, last_rev)
             # our gist has newer version than we
             success = False
 
diff --git a/rhodecode/apps/login/views.py b/rhodecode/apps/login/views.py
--- a/rhodecode/apps/login/views.py
+++ b/rhodecode/apps/login/views.py
@@ -93,16 +93,16 @@ def get_came_from(request):
     allowed_schemes = ['http', 'https']
     default_came_from = h.route_path('home')
     if parsed.scheme and parsed.scheme not in allowed_schemes:
-        log.error('Suspicious URL scheme detected %s for url %s' %
-                  (parsed.scheme, parsed))
+        log.error('Suspicious URL scheme detected %s for url %s',
+                  parsed.scheme, parsed)
         came_from = default_came_from
     elif parsed.netloc and request.host != parsed.netloc:
         log.error('Suspicious NETLOC detected %s for url %s server url '
-                  'is: %s' % (parsed.netloc, parsed, request.host))
+                  'is: %s', parsed.netloc, parsed, request.host)
         came_from = default_came_from
     elif any(bad_str in parsed.path for bad_str in ('\r', '\n')):
-        log.error('Header injection detected `%s` for url %s server url ' %
-                  (parsed.path, parsed))
+        log.error('Header injection detected `%s` for url %s server url ',
+                  parsed.path, parsed)
         came_from = default_came_from
 
     return came_from or default_came_from
diff --git a/rhodecode/apps/repository/views/repo_compare.py b/rhodecode/apps/repository/views/repo_compare.py
--- a/rhodecode/apps/repository/views/repo_compare.py
+++ b/rhodecode/apps/repository/views/repo_compare.py
@@ -256,8 +256,8 @@ class RepoCompareView(RepoAppView):
             # case we want a simple diff without incoming commits,
             # previewing what will be merged.
             # Make the diff on target repo (which is known to have target_ref)
-            log.debug('Using ancestor %s as source_ref instead of %s'
-                      % (c.ancestor, source_ref))
+            log.debug('Using ancestor %s as source_ref instead of %s',
+                      c.ancestor, source_ref)
             source_repo = target_repo
             source_commit = target_repo.get_commit(commit_id=c.ancestor)
 
diff --git a/rhodecode/apps/repository/views/repo_strip.py b/rhodecode/apps/repository/views/repo_strip.py
--- a/rhodecode/apps/repository/views/repo_strip.py
+++ b/rhodecode/apps/repository/views/repo_strip.py
@@ -98,8 +98,8 @@ class StripView(RepoAppView):
                 ScmModel().strip(
                     repo=self.db_repo,
                     commit_id=commit['rev'], branch=commit['branch'])
-                log.info('Stripped commit %s from repo `%s` by %s' % (
-                    commit['rev'], self.db_repo_name, user))
+                log.info('Stripped commit %s from repo `%s` by %s',
+                         commit['rev'], self.db_repo_name, user)
                 data[commit['rev']] = True
 
                 audit_logger.store_web(
@@ -108,6 +108,6 @@ class StripView(RepoAppView):
 
             except Exception as e:
                 data[commit['rev']] = False
-                log.debug('Stripped commit %s from repo `%s` failed by %s, exeption %s' % (
-                    commit['rev'], self.db_repo_name, user, e.message))
+                log.debug('Stripped commit %s from repo `%s` failed by %s, exeption %s',
+                          commit['rev'], self.db_repo_name, user, e.message)
         return data
diff --git a/rhodecode/authentication/plugins/auth_crowd.py b/rhodecode/authentication/plugins/auth_crowd.py
--- a/rhodecode/authentication/plugins/auth_crowd.py
+++ b/rhodecode/authentication/plugins/auth_crowd.py
@@ -241,16 +241,16 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
             log.debug('Empty username or password skipping...')
             return None
 
-        log.debug("Crowd settings: \n%s" % (formatted_json(settings)))
+        log.debug("Crowd settings: \n%s", formatted_json(settings))
         server = CrowdServer(**settings)
         server.set_credentials(settings["app_name"], settings["app_password"])
         crowd_user = server.user_auth(username, password)
-        log.debug("Crowd returned: \n%s" % (formatted_json(crowd_user)))
+        log.debug("Crowd returned: \n%s", formatted_json(crowd_user))
         if not crowd_user["status"]:
             return None
 
         res = server.user_groups(crowd_user["name"])
-        log.debug("Crowd groups: \n%s" % (formatted_json(res)))
+        log.debug("Crowd groups: \n%s", formatted_json(res))
         crowd_user["groups"] = [x["name"] for x in res["groups"]]
 
         # old attrs fetched from RhodeCode database
@@ -280,6 +280,6 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
         for group in settings["admin_groups"]:
             if group in user_attrs["groups"]:
                 user_attrs["admin"] = True
-        log.debug("Final crowd user object: \n%s" % (formatted_json(user_attrs)))
-        log.info('user `%s` authenticated correctly' % user_attrs['username'])
+        log.debug("Final crowd user object: \n%s", formatted_json(user_attrs))
+        log.info('user `%s` authenticated correctly', user_attrs['username'])
         return user_attrs
diff --git a/rhodecode/authentication/plugins/auth_headers.py b/rhodecode/authentication/plugins/auth_headers.py
--- a/rhodecode/authentication/plugins/auth_headers.py
+++ b/rhodecode/authentication/plugins/auth_headers.py
@@ -125,24 +125,24 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
         username = None
         environ = environ or {}
         if not environ:
-            log.debug('got empty environ: %s' % environ)
+            log.debug('got empty environ: %s', environ)
 
         settings = settings or {}
         if settings.get('header'):
             header = settings.get('header')
             username = environ.get(header)
-            log.debug('extracted %s:%s' % (header, username))
+            log.debug('extracted %s:%s', header, username)
 
         # fallback mode
         if not username and settings.get('fallback_header'):
             header = settings.get('fallback_header')
             username = environ.get(header)
-            log.debug('extracted %s:%s' % (header, username))
+            log.debug('extracted %s:%s', header, username)
 
         if username and str2bool(settings.get('clean_username')):
-            log.debug('Received username `%s` from headers' % username)
+            log.debug('Received username `%s` from headers', username)
             username = self._clean_username(username)
-            log.debug('New cleanup user is:%s' % username)
+            log.debug('New cleanup user is:%s', username)
         return username
 
     def get_user(self, username=None, **kwargs):
@@ -221,5 +221,5 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
             'extern_type': extern_type,
         }
 
-        log.info('user `%s` authenticated correctly' % user_attrs['username'])
+        log.info('user `%s` authenticated correctly', user_attrs['username'])
         return user_attrs
diff --git a/rhodecode/authentication/plugins/auth_jasig_cas.py b/rhodecode/authentication/plugins/auth_jasig_cas.py
--- a/rhodecode/authentication/plugins/auth_jasig_cas.py
+++ b/rhodecode/authentication/plugins/auth_jasig_cas.py
@@ -134,10 +134,10 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
         try:
             response = urllib2.urlopen(request)
         except urllib2.HTTPError as e:
-            log.debug("HTTPError when requesting Jasig CAS (status code: %d)" % e.code)
+            log.debug("HTTPError when requesting Jasig CAS (status code: %d)", e.code)
             return None
         except urllib2.URLError as e:
-            log.debug("URLError when requesting Jasig CAS url: %s " % url)
+            log.debug("URLError when requesting Jasig CAS url: %s ", url)
             return None
 
         # old attrs fetched from RhodeCode database
@@ -163,5 +163,5 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
             'extern_type': extern_type,
         }
 
-        log.info('user `%s` authenticated correctly' % user_attrs['username'])
+        log.info('user `%s` authenticated correctly', user_attrs['username'])
         return user_attrs
diff --git a/rhodecode/authentication/plugins/auth_pam.py b/rhodecode/authentication/plugins/auth_pam.py
--- a/rhodecode/authentication/plugins/auth_pam.py
+++ b/rhodecode/authentication/plugins/auth_pam.py
@@ -115,10 +115,10 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
         auth_result = _pam.authenticate(username, password, settings["service"])
 
         if not auth_result:
-            log.error("PAM was unable to authenticate user: %s" % (username, ))
+            log.error("PAM was unable to authenticate user: %s", username)
             return None
 
-        log.debug('Got PAM response %s' % (auth_result, ))
+        log.debug('Got PAM response %s', auth_result)
 
         # old attrs fetched from RhodeCode database
         default_email = "%s@%s" % (username, socket.gethostname())
@@ -157,5 +157,5 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
             pass
 
         log.debug("pamuser: %s", user_attrs)
-        log.info('user `%s` authenticated correctly' % user_attrs['username'])
+        log.info('user `%s` authenticated correctly', user_attrs['username'])
         return user_attrs
diff --git a/rhodecode/authentication/plugins/auth_rhodecode.py b/rhodecode/authentication/plugins/auth_rhodecode.py
--- a/rhodecode/authentication/plugins/auth_rhodecode.py
+++ b/rhodecode/authentication/plugins/auth_rhodecode.py
@@ -87,12 +87,12 @@ class RhodeCodeAuthPlugin(RhodeCodeAuthP
 
     def auth(self, userobj, username, password, settings, **kwargs):
         if not userobj:
-            log.debug('userobj was:%s skipping' % (userobj, ))
+            log.debug('userobj was:%s skipping', userobj)
             return None
         if userobj.extern_type != self.name:
             log.warning(
-                "userobj:%s extern_type mismatch got:`%s` expected:`%s`" %
-                (userobj, userobj.extern_type, self.name))
+                "userobj:%s extern_type mismatch got:`%s` expected:`%s`",
+                userobj, userobj.extern_type, self.name)
             return None
 
         user_attrs = {
@@ -109,7 +109,7 @@ class RhodeCodeAuthPlugin(RhodeCodeAuthP
             "extern_type": userobj.extern_type,
         }
 
-        log.debug("User attributes:%s" % (user_attrs, ))
+        log.debug("User attributes:%s", user_attrs)
         if userobj.active:
             from rhodecode.lib import auth
             crypto_backend = auth.crypto_backend()
diff --git a/rhodecode/authentication/plugins/auth_token.py b/rhodecode/authentication/plugins/auth_token.py
--- a/rhodecode/authentication/plugins/auth_token.py
+++ b/rhodecode/authentication/plugins/auth_token.py
@@ -103,7 +103,7 @@ class RhodeCodeAuthPlugin(RhodeCodeAuthP
 
     def auth(self, userobj, username, password, settings, **kwargs):
         if not userobj:
-            log.debug('userobj was:%s skipping' % (userobj, ))
+            log.debug('userobj was:%s skipping', userobj)
             return None
 
         user_attrs = {
diff --git a/rhodecode/events/repo.py b/rhodecode/events/repo.py
--- a/rhodecode/events/repo.py
+++ b/rhodecode/events/repo.py
@@ -133,7 +133,7 @@ def _commits_as_dict(event, commit_ids, 
     missing_commits = set(commit_ids) - set(c['raw_id'] for c in commits)
     if missing_commits:
         log.error('Inconsistent repository state. '
-                  'Missing commits: %s' % ', '.join(missing_commits))
+                  'Missing commits: %s', ', '.join(missing_commits))
 
     return commits
 
diff --git a/rhodecode/integrations/__init__.py b/rhodecode/integrations/__init__.py
--- a/rhodecode/integrations/__init__.py
+++ b/rhodecode/integrations/__init__.py
@@ -66,8 +66,8 @@ def integrations_event_handler(event):
             exc_info = sys.exc_info()
             store_exception(id(exc_info), exc_info)
             log.exception(
-                'failure occurred when sending event %s to integration %s' % (
-                    event, integration))
+                'failure occurred when sending event %s to integration %s',
+                event, integration)
 
 
 def includeme(config):
diff --git a/rhodecode/integrations/registry.py b/rhodecode/integrations/registry.py
--- a/rhodecode/integrations/registry.py
+++ b/rhodecode/integrations/registry.py
@@ -31,8 +31,7 @@ class IntegrationTypeRegistry(collection
         key = IntegrationType.key
         if key in self:
             log.debug(
-                'Overriding existing integration type %s (%s) with %s' % (
-                    self[key], key, IntegrationType))
+                'Overriding existing integration type %s (%s) with %s',
+                self[key], key, IntegrationType)
 
         self[key] = IntegrationType
-
diff --git a/rhodecode/integrations/types/hipchat.py b/rhodecode/integrations/types/hipchat.py
--- a/rhodecode/integrations/types/hipchat.py
+++ b/rhodecode/integrations/types/hipchat.py
@@ -119,11 +119,11 @@ class HipchatIntegrationType(Integration
 
     def send_event(self, event):
         if event.__class__ not in self.valid_events:
-            log.debug('event not valid: %r' % event)
+            log.debug('event not valid: %r', event)
             return
 
         if event.name not in self.settings['events']:
-            log.debug('event ignored: %r' % event)
+            log.debug('event ignored: %r', event)
             return
 
         data = event.as_dict()
@@ -131,7 +131,7 @@ class HipchatIntegrationType(Integration
         text = '<b>%s<b> caused a <b>%s</b> event' % (
             data['actor']['username'], event.name)
 
-        log.debug('handling hipchat event for %s' % event.name)
+        log.debug('handling hipchat event for %s', event.name)
 
         if isinstance(event, events.PullRequestCommentEvent):
             text = self.format_pull_request_comment_event(event, data)
@@ -144,7 +144,7 @@ class HipchatIntegrationType(Integration
         elif isinstance(event, events.RepoCreateEvent):
             text = self.format_repo_create_event(data)
         else:
-            log.error('unhandled event type: %r' % event)
+            log.error('unhandled event type: %r', event)
 
         run_task(post_text_to_hipchat, self.settings, text)
 
@@ -242,7 +242,7 @@ class HipchatIntegrationType(Integration
 
 @async_task(ignore_result=True, base=RequestContextTask)
 def post_text_to_hipchat(settings, text):
-    log.debug('sending %s to hipchat %s' % (text, settings['server_url']))
+    log.debug('sending %s to hipchat %s', text, settings['server_url'])
     json_message = {
         "message": text,
         "color": settings.get('color', 'yellow'),
diff --git a/rhodecode/integrations/types/slack.py b/rhodecode/integrations/types/slack.py
--- a/rhodecode/integrations/types/slack.py
+++ b/rhodecode/integrations/types/slack.py
@@ -110,11 +110,11 @@ class SlackIntegrationType(IntegrationTy
 
     def send_event(self, event):
         if event.__class__ not in self.valid_events:
-            log.debug('event not valid: %r' % event)
+            log.debug('event not valid: %r', event)
             return
 
         if event.name not in self.settings['events']:
-            log.debug('event ignored: %r' % event)
+            log.debug('event ignored: %r', event)
             return
 
         data = event.as_dict()
@@ -127,7 +127,7 @@ class SlackIntegrationType(IntegrationTy
         fields = None
         overrides = None
 
-        log.debug('handling slack event for %s' % event.name)
+        log.debug('handling slack event for %s', event.name)
 
         if isinstance(event, events.PullRequestCommentEvent):
             (title, text, fields, overrides) \
@@ -141,7 +141,7 @@ class SlackIntegrationType(IntegrationTy
         elif isinstance(event, events.RepoCreateEvent):
             title, text = self.format_repo_create_event(data)
         else:
-            log.error('unhandled event type: %r' % event)
+            log.error('unhandled event type: %r', event)
 
         run_task(post_text_to_slack, self.settings, title, text, fields, overrides)
 
@@ -314,8 +314,7 @@ def html_to_slack_links(message):
 
 @async_task(ignore_result=True, base=RequestContextTask)
 def post_text_to_slack(settings, title, text, fields=None, overrides=None):
-    log.debug('sending %s (%s) to slack %s' % (
-        title, text, settings['service']))
+    log.debug('sending %s (%s) to slack %s', title, text, settings['service'])
 
     fields = fields or []
     overrides = overrides or {}
diff --git a/rhodecode/integrations/types/webhook.py b/rhodecode/integrations/types/webhook.py
--- a/rhodecode/integrations/types/webhook.py
+++ b/rhodecode/integrations/types/webhook.py
@@ -171,11 +171,11 @@ class WebhookIntegrationType(Integration
             'handling event %s with Webhook integration %s', event.name, self)
 
         if event.__class__ not in self.valid_events:
-            log.debug('event not valid: %r' % event)
+            log.debug('event not valid: %r', event)
             return
 
         if event.name not in self.settings['events']:
-            log.debug('event ignored: %r' % event)
+            log.debug('event ignored: %r', event)
             return
 
         data = event.as_dict()
diff --git a/rhodecode/lib/auth.py b/rhodecode/lib/auth.py
--- a/rhodecode/lib/auth.py
+++ b/rhodecode/lib/auth.py
@@ -979,7 +979,7 @@ def allowed_auth_token_access(view_name,
     }
 
     log.debug(
-        'Allowed views for AUTH TOKEN access: %s' % (whitelist,))
+        'Allowed views for AUTH TOKEN access: %s', whitelist)
     auth_token_access_valid = False
 
     for entry in whitelist:
@@ -998,8 +998,9 @@ def allowed_auth_token_access(view_name,
             break
 
     if auth_token_access_valid:
-        log.debug('view: `%s` matches entry in whitelist: %s'
-                  % (view_name, whitelist))
+        log.debug('view: `%s` matches entry in whitelist: %s',
+                  view_name, whitelist)
+
     else:
         msg = ('view: `%s` does *NOT* match any entry in whitelist: %s'
                % (view_name, whitelist))
@@ -1190,7 +1191,7 @@ class AuthUser(object):
 
         log.debug(
             'Computing PERMISSION tree for user %s scope `%s` '
-            'with caching: %s[TTL: %ss]' % (user, scope, cache_on, cache_seconds or 0))
+            'with caching: %s[TTL: %ss]', user, scope, cache_on, cache_seconds or 0)
 
         cache_namespace_uid = 'cache_user_auth.{}'.format(user_id)
         region = rc_cache.get_or_create_region('cache_perms', cache_namespace_uid)
@@ -1214,8 +1215,8 @@ class AuthUser(object):
         for k in result:
             result_repr.append((k, len(result[k])))
         total = time.time() - start
-        log.debug('PERMISSION tree for user %s computed in %.3fs: %s' % (
-            user, total, result_repr))
+        log.debug('PERMISSION tree for user %s computed in %.3fs: %s',
+                  user, total, result_repr)
 
         return result
 
@@ -1352,12 +1353,12 @@ class AuthUser(object):
         allowed_ips = AuthUser.get_allowed_ips(
             user_id, cache=True, inherit_from_default=inherit_from_default)
         if check_ip_access(source_ip=ip_addr, allowed_ips=allowed_ips):
-            log.debug('IP:%s for user %s is in range of %s' % (
-                ip_addr, user_id, allowed_ips))
+            log.debug('IP:%s for user %s is in range of %s',
+                      ip_addr, user_id, allowed_ips)
             return True
         else:
             log.info('Access for IP:%s forbidden for user %s, '
-                     'not in %s' % (ip_addr, user_id, allowed_ips))
+                     'not in %s', ip_addr, user_id, allowed_ips)
             return False
 
     def get_branch_permissions(self, repo_name, perms=None):
@@ -1593,7 +1594,7 @@ class LoginRequired(object):
         _ = request.translate
 
         loc = "%s:%s" % (cls.__class__.__name__, func.__name__)
-        log.debug('Starting login restriction checks for user: %s' % (user,))
+        log.debug('Starting login restriction checks for user: %s', user)
         # check if our IP is allowed
         ip_access_valid = True
         if not user.ip_allowed:
@@ -1610,7 +1611,7 @@ class LoginRequired(object):
 
         # explicit controller is enabled or API is in our whitelist
         if self.auth_token_access or auth_token_access_valid:
-            log.debug('Checking AUTH TOKEN access for %s' % (cls,))
+            log.debug('Checking AUTH TOKEN access for %s', cls)
             db_user = user.get_instance()
 
             if db_user:
@@ -1626,36 +1627,33 @@ class LoginRequired(object):
 
             if _auth_token and token_match:
                 auth_token_access_valid = True
-                log.debug('AUTH TOKEN ****%s is VALID' % (_auth_token[-4:],))
+                log.debug('AUTH TOKEN ****%s is VALID', _auth_token[-4:])
             else:
                 auth_token_access_valid = False
                 if not _auth_token:
                     log.debug("AUTH TOKEN *NOT* present in request")
                 else:
-                    log.warning(
-                        "AUTH TOKEN ****%s *NOT* valid" % _auth_token[-4:])
-
-        log.debug('Checking if %s is authenticated @ %s' % (user.username, loc))
+                    log.warning("AUTH TOKEN ****%s *NOT* valid", _auth_token[-4:])
+
+        log.debug('Checking if %s is authenticated @ %s', user.username, loc)
         reason = 'RHODECODE_AUTH' if user.is_authenticated \
             else 'AUTH_TOKEN_AUTH'
 
         if ip_access_valid and (
                 user.is_authenticated or auth_token_access_valid):
-            log.info(
-                'user %s authenticating with:%s IS authenticated on func %s'
-                % (user, reason, loc))
+            log.info('user %s authenticating with:%s IS authenticated on func %s',
+                     user, reason, loc)
 
             return func(*fargs, **fkwargs)
         else:
             log.warning(
                 'user %s authenticating with:%s NOT authenticated on '
-                'func: %s: IP_ACCESS:%s AUTH_TOKEN_ACCESS:%s'
-                % (user, reason, loc, ip_access_valid,
-                   auth_token_access_valid))
+                'func: %s: IP_ACCESS:%s AUTH_TOKEN_ACCESS:%s',
+                user, reason, loc, ip_access_valid, auth_token_access_valid)
             # we preserve the get PARAM
             came_from = get_came_from(request)
 
-            log.debug('redirecting to login page with %s' % (came_from,))
+            log.debug('redirecting to login page with %s', came_from)
             raise HTTPFound(
                 h.route_path('login', _query={'came_from': came_from}))
 
@@ -1678,7 +1676,7 @@ class NotAnonymous(object):
         self.user = cls._rhodecode_user
         request = self._get_request()
         _ = request.translate
-        log.debug('Checking if user is not anonymous @%s' % cls)
+        log.debug('Checking if user is not anonymous @%s', cls)
 
         anonymous = self.user.username == User.DEFAULT_USER
 
@@ -1939,7 +1937,7 @@ class PermsFunction(object):
         frame = inspect.currentframe()
         stack_trace = traceback.format_stack(frame)
         log.error('Checking bool value on a class instance of perm '
-                  'function is not allowed: %s' % ''.join(stack_trace))
+                  'function is not allowed: %s', ''.join(stack_trace))
         # rather than throwing errors, here we always return False so if by
         # accident someone checks truth for just an instance it will always end
         # up in returning False
@@ -2182,9 +2180,8 @@ class _BaseApiPerm(object):
         if user_group_name:
             check_scope += ', user_group_name:%s' % (user_group_name,)
 
-        log.debug(
-            'checking cls:%s %s %s @ %s'
-            % (cls_name, self.required_perms, check_scope, check_location))
+        log.debug('checking cls:%s %s %s @ %s',
+                  cls_name, self.required_perms, check_scope, check_location)
         if not user:
             log.debug('Empty User passed into arguments')
             return False
@@ -2305,7 +2302,7 @@ def check_ip_access(source_ip, allowed_i
     :param source_ip:
     :param allowed_ips: list of allowed ips together with mask
     """
-    log.debug('checking if ip:%s is subnet of %s' % (source_ip, allowed_ips))
+    log.debug('checking if ip:%s is subnet of %s', source_ip, allowed_ips)
     source_ip_address = ipaddress.ip_address(safe_unicode(source_ip))
     if isinstance(allowed_ips, (tuple, list, set)):
         for ip in allowed_ips:
@@ -2313,8 +2310,7 @@ def check_ip_access(source_ip, allowed_i
             try:
                 network_address = ipaddress.ip_network(ip, strict=False)
                 if source_ip_address in network_address:
-                    log.debug('IP %s is network %s' %
-                              (source_ip_address, network_address))
+                    log.debug('IP %s is network %s', source_ip_address, network_address)
                     return True
                 # for any case we cannot determine the IP, don't crash just
                 # skip it and log as error, we want to say forbidden still when
diff --git a/rhodecode/lib/base.py b/rhodecode/lib/base.py
--- a/rhodecode/lib/base.py
+++ b/rhodecode/lib/base.py
@@ -216,7 +216,7 @@ class BasicAuth(AuthBasicAuthenticator):
         try:
             return get_exception(safe_int(http_code))
         except Exception:
-            log.exception('Failed to fetch response for code %s' % http_code)
+            log.exception('Failed to fetch response for code %s', http_code)
             return HTTPForbidden
 
     def get_rc_realm(self):
diff --git a/rhodecode/lib/codeblocks.py b/rhodecode/lib/codeblocks.py
--- a/rhodecode/lib/codeblocks.py
+++ b/rhodecode/lib/codeblocks.py
@@ -442,7 +442,7 @@ class DiffSet(object):
         return self._lexer_cache[filename]
 
     def render_patch(self, patch):
-        log.debug('rendering diff for %r' % patch['filename'])
+        log.debug('rendering diff for %r', patch['filename'])
 
         source_filename = patch['original_filename']
         target_filename = patch['filename']
diff --git a/rhodecode/lib/db_manage.py b/rhodecode/lib/db_manage.py
--- a/rhodecode/lib/db_manage.py
+++ b/rhodecode/lib/db_manage.py
@@ -107,7 +107,7 @@ class DbManage(object):
 
         checkfirst = not override
         Base.metadata.create_all(checkfirst=checkfirst)
-        log.info('Created tables for %s' % self.dbname)
+        log.info('Created tables for %s', self.dbname)
 
     def set_db_version(self):
         ver = DbMigrateVersion()
@@ -115,7 +115,7 @@ class DbManage(object):
         ver.repository_id = 'rhodecode_db_migrations'
         ver.repository_path = 'versions'
         self.sa.add(ver)
-        log.info('db version set to: %s' % __dbversion__)
+        log.info('db version set to: %s', __dbversion__)
 
     def run_pre_migration_tasks(self):
         """
@@ -402,7 +402,7 @@ class DbManage(object):
                         ('auth_rhodecode_enabled', 'True', 'bool')]:
             if (skip_existing and
                     SettingsModel().get_setting_by_name(k) is not None):
-                log.debug('Skipping option %s' % k)
+                log.debug('Skipping option %s', k)
                 continue
             setting = RhodeCodeSetting(k, v, t)
             self.sa.add(setting)
@@ -419,7 +419,7 @@ class DbManage(object):
 
             if (skip_existing and
                     SettingsModel().get_setting_by_name(k) is not None):
-                log.debug('Skipping option %s' % k)
+                log.debug('Skipping option %s', k)
                 continue
             setting = RhodeCodeSetting(k, v, t)
             self.sa.add(setting)
@@ -436,7 +436,7 @@ class DbManage(object):
                 .scalar()
 
             if default is None:
-                log.debug('missing default permission for group %s adding' % g)
+                log.debug('missing default permission for group %s adding', g)
                 perm_obj = RepoGroupModel()._create_default_perms(g)
                 self.sa.add(perm_obj)
 
@@ -484,20 +484,20 @@ class DbManage(object):
         # check proper dir
         if not os.path.isdir(path):
             path_ok = False
-            log.error('Given path %s is not a valid directory' % (path,))
+            log.error('Given path %s is not a valid directory', path)
 
         elif not os.path.isabs(path):
             path_ok = False
-            log.error('Given path %s is not an absolute path' % (path,))
+            log.error('Given path %s is not an absolute path', path)
 
         # check if path is at least readable.
         if not os.access(path, os.R_OK):
             path_ok = False
-            log.error('Given path %s is not readable' % (path,))
+            log.error('Given path %s is not readable', path)
 
         # check write access, warn user about non writeable paths
         elif not os.access(path, os.W_OK) and path_ok:
-            log.warning('No write permission to given path %s' % (path,))
+            log.warning('No write permission to given path %s', path)
 
             q = ('Given path %s is not writeable, do you want to '
                  'continue with read only mode ? [y/n]' % (path,))
@@ -573,7 +573,7 @@ class DbManage(object):
 
     def create_user(self, username, password, email='', admin=False,
                     strict_creation_check=True, api_key=None):
-        log.info('creating user `%s`' % username)
+        log.info('creating user `%s`', username)
         user = UserModel().create_or_update(
             username, password, email, firstname=u'RhodeCode', lastname=u'Admin',
             active=True, admin=admin, extern_type="rhodecode",
diff --git a/rhodecode/lib/dbmigrate/migrate/versioning/migrate_repository.py b/rhodecode/lib/dbmigrate/migrate/versioning/migrate_repository.py
--- a/rhodecode/lib/dbmigrate/migrate/versioning/migrate_repository.py
+++ b/rhodecode/lib/dbmigrate/migrate/versioning/migrate_repository.py
@@ -25,13 +25,13 @@ def usage():
 
 def delete_file(filepath):
     """Deletes a file and prints a message."""
-    log.info('Deleting file: %s' % filepath)
+    log.info('Deleting file: %s', filepath)
     os.remove(filepath)
 
 
 def move_file(src, tgt):
     """Moves a file and prints a message."""
-    log.info('Moving file %s to %s' % (src, tgt))
+    log.info('Moving file %s to %s', src, tgt)
     if os.path.exists(tgt):
         raise Exception(
             'Cannot move file %s because target %s already exists' % \
@@ -41,13 +41,13 @@ def move_file(src, tgt):
 
 def delete_directory(dirpath):
     """Delete a directory and print a message."""
-    log.info('Deleting directory: %s' % dirpath)
+    log.info('Deleting directory: %s', dirpath)
     os.rmdir(dirpath)
 
 
 def migrate_repository(repos):
     """Does the actual migration to the new repository format."""
-    log.info('Migrating repository at: %s to new format' % repos)
+    log.info('Migrating repository at: %s to new format', repos)
     versions = '%s/versions' % repos
     dirs = os.listdir(versions)
     # Only use int's in list.
@@ -55,7 +55,7 @@ def migrate_repository(repos):
     numdirs.sort()  # Sort list.
     for dirname in numdirs:
         origdir = '%s/%s' % (versions, dirname)
-        log.info('Working on directory: %s' % origdir)
+        log.info('Working on directory: %s', origdir)
         files = os.listdir(origdir)
         files.sort()
         for filename in files:
diff --git a/rhodecode/lib/dbmigrate/migrate/versioning/pathed.py b/rhodecode/lib/dbmigrate/migrate/versioning/pathed.py
--- a/rhodecode/lib/dbmigrate/migrate/versioning/pathed.py
+++ b/rhodecode/lib/dbmigrate/migrate/versioning/pathed.py
@@ -35,7 +35,7 @@ class Pathed(KeyedInstance):
         """Try to initialize this object's parent, if it has one"""
         parent_path = self.__class__._parent_path(path)
         self.parent = self.__class__.parent(parent_path)
-        log.debug("Getting parent %r:%r" % (self.__class__.parent, parent_path))
+        log.debug("Getting parent %r:%r", self.__class__.parent, parent_path)
         self.parent._init_child(path, self)
 
     def _init_child(self, child, path):
diff --git a/rhodecode/lib/dbmigrate/migrate/versioning/repository.py b/rhodecode/lib/dbmigrate/migrate/versioning/repository.py
--- a/rhodecode/lib/dbmigrate/migrate/versioning/repository.py
+++ b/rhodecode/lib/dbmigrate/migrate/versioning/repository.py
@@ -73,14 +73,14 @@ class Repository(pathed.Pathed):
     _versions = 'versions'
 
     def __init__(self, path):
-        log.debug('Loading repository %s...' % path)
+        log.debug('Loading repository %s...', path)
         self.verify(path)
         super(Repository, self).__init__(path)
         self.config = cfgparse.Config(os.path.join(self.path, self._config))
         self.versions = version.Collection(os.path.join(self.path,
                                                       self._versions))
-        log.debug('Repository %s loaded successfully' % path)
-        log.debug('Config: %r' % self.config.to_dict())
+        log.debug('Repository %s loaded successfully', path)
+        log.debug('Config: %r', self.config.to_dict())
 
     @classmethod
     def verify(cls, path):
diff --git a/rhodecode/lib/dbmigrate/migrate/versioning/script/base.py b/rhodecode/lib/dbmigrate/migrate/versioning/script/base.py
--- a/rhodecode/lib/dbmigrate/migrate/versioning/script/base.py
+++ b/rhodecode/lib/dbmigrate/migrate/versioning/script/base.py
@@ -24,10 +24,10 @@ class BaseScript(pathed.Pathed):
     """ # TODO: sphinxfy this and implement it correctly
 
     def __init__(self, path):
-        log.debug('Loading script %s...' % path)
+        log.debug('Loading script %s...', path)
         self.verify(path)
         super(BaseScript, self).__init__(path)
-        log.debug('Script %s loaded successfully' % path)
+        log.debug('Script %s loaded successfully', path)
 
     @classmethod
     def verify(cls, path):
diff --git a/rhodecode/lib/dbmigrate/schema/db_1_2_0.py b/rhodecode/lib/dbmigrate/schema/db_1_2_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_1_2_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_1_2_0.py
@@ -311,7 +311,7 @@ class User(Base, BaseModel):
         self.last_login = datetime.datetime.now()
         Session.add(self)
         Session.commit()
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     @classmethod
     def create(cls, form_data):
@@ -656,7 +656,7 @@ class Repository(Base, BaseModel):
 
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository' % alias)
+            log.debug('Creating instance of %s repository', alias)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -731,7 +731,7 @@ class Group(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error('group nested more than %s' %
+                log.error('group nested more than %s',
                           parents_recursion_limit)
                 break
 
@@ -1006,7 +1006,7 @@ class CacheInvalidation(Base, BaseModel)
         :param key:
         """
 
-        log.debug('marking %s for invalidation' % key)
+        log.debug('marking %s for invalidation', key)
         inv_obj = Session.query(cls)\
             .filter(cls.cache_key == key).scalar()
         if inv_obj:
diff --git a/rhodecode/lib/dbmigrate/schema/db_1_3_0.py b/rhodecode/lib/dbmigrate/schema/db_1_3_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_1_3_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_1_3_0.py
@@ -379,7 +379,7 @@ class User(Base, BaseModel):
         """Update user lastlogin"""
         self.last_login = datetime.datetime.now()
         Session.add(self)
-        log.debug('updated user %s lastlogin' % self.username)
+        log.debug('updated user %s lastlogin', self.username)
 
     def __json__(self):
         return dict(
@@ -676,7 +676,7 @@ class Repository(Base, BaseModel):
         repo_full_path = self.repo_full_path
         try:
             alias = get_scm(repo_full_path)[0]
-            log.debug('Creating instance of %s repository' % alias)
+            log.debug('Creating instance of %s repository', alias)
             backend = get_backend(alias)
         except VCSError:
             log.error(traceback.format_exc())
@@ -760,8 +760,7 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error('group nested more than %s' %
-                          parents_recursion_limit)
+                log.error('group nested more than %s', parents_recursion_limit)
                 break
 
             groups.insert(0, gr)
@@ -1095,8 +1094,7 @@ class CacheInvalidation(Base, BaseModel)
 
         key, _prefix, _org_key = cls._get_key(key)
         inv_objs = Session.query(cls).filter(cls.cache_args == _org_key).all()
-        log.debug('marking %s key[s] %s for invalidation' % (len(inv_objs),
-                                                             _org_key))
+        log.debug('marking %s key[s] %s for invalidation', len(inv_objs), _org_key)
         try:
             for inv_obj in inv_objs:
                 if inv_obj:
diff --git a/rhodecode/lib/dbmigrate/schema/db_1_6_0.py b/rhodecode/lib/dbmigrate/schema/db_1_6_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_1_6_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_1_6_0.py
@@ -614,15 +614,13 @@ class Repository(Base, BaseModel):
         if (cs_cache != self.changeset_cache or not self.changeset_cache):
             _default = datetime.datetime.fromtimestamp(0)
             last_change = cs_cache.get('date') or _default
-            log.debug('updated repo %s with new cs cache %s'
-                      % (self.repo_name, cs_cache))
+            log.debug('updated repo %s with new cs cache %s', self.repo_name, cs_cache)
             self.updated_on = last_change
             self.changeset_cache = cs_cache
             Session().add(self)
             Session().commit()
         else:
-            log.debug('Skipping repo:%s already with latest changes'
-                      % self.repo_name)
+            log.debug('Skipping repo:%s already with latest changes', self.repo_name)
 
 class RepoGroup(Base, BaseModel):
     __tablename__ = 'groups'
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_11_0_0.py b/rhodecode/lib/dbmigrate/schema/db_4_11_0_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_11_0_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_11_0_0.py
@@ -2415,8 +2415,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_13_0_0.py b/rhodecode/lib/dbmigrate/schema/db_4_13_0_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_13_0_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_13_0_0.py
@@ -2481,8 +2481,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_3_0_0.py b/rhodecode/lib/dbmigrate/schema/db_4_3_0_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_3_0_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_3_0_0.py
@@ -2108,8 +2108,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_4_0_0.py b/rhodecode/lib/dbmigrate/schema/db_4_4_0_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_4_0_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_4_0_0.py
@@ -2100,8 +2100,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_4_0_1.py b/rhodecode/lib/dbmigrate/schema/db_4_4_0_1.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_4_0_1.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_4_0_1.py
@@ -2100,8 +2100,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_4_0_2.py b/rhodecode/lib/dbmigrate/schema/db_4_4_0_2.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_4_0_2.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_4_0_2.py
@@ -2104,8 +2104,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_5_0_0.py b/rhodecode/lib/dbmigrate/schema/db_4_5_0_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_5_0_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_5_0_0.py
@@ -2104,8 +2104,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_7_0_0.py b/rhodecode/lib/dbmigrate/schema/db_4_7_0_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_7_0_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_7_0_0.py
@@ -2154,8 +2154,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_7_0_1.py b/rhodecode/lib/dbmigrate/schema/db_4_7_0_1.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_7_0_1.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_7_0_1.py
@@ -2155,8 +2155,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/schema/db_4_9_0_0.py b/rhodecode/lib/dbmigrate/schema/db_4_9_0_0.py
--- a/rhodecode/lib/dbmigrate/schema/db_4_9_0_0.py
+++ b/rhodecode/lib/dbmigrate/schema/db_4_9_0_0.py
@@ -2352,8 +2352,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/lib/dbmigrate/versions/001_initial_release.py b/rhodecode/lib/dbmigrate/versions/001_initial_release.py
--- a/rhodecode/lib/dbmigrate/versions/001_initial_release.py
+++ b/rhodecode/lib/dbmigrate/versions/001_initial_release.py
@@ -74,7 +74,7 @@ class User(Base):
             self.last_login = datetime.datetime.now()
             session.add(self)
             session.commit()
-            log.debug('updated user %s lastlogin' % self.username)
+            log.debug('updated user %s lastlogin', self.username)
         except (DatabaseError,):
             session.rollback()
 
diff --git a/rhodecode/lib/dbmigrate/versions/008_version_1_5_0.py b/rhodecode/lib/dbmigrate/versions/008_version_1_5_0.py
--- a/rhodecode/lib/dbmigrate/versions/008_version_1_5_0.py
+++ b/rhodecode/lib/dbmigrate/versions/008_version_1_5_0.py
@@ -102,7 +102,7 @@ def fixups(models, _SESSION):
     perms = models.UserToPerm.query().filter(models.UserToPerm.user == user).all()
     defined_perms_groups = map(
         _get_group, (x.permission.permission_name for x in perms))
-    log.debug('GOT ALREADY DEFINED:%s' % perms)
+    log.debug('GOT ALREADY DEFINED:%s', perms)
     DEFAULT_PERMS = models.Permission.DEFAULT_USER_PERMISSIONS
 
     # for every default permission that needs to be created, we check if
@@ -110,8 +110,7 @@ def fixups(models, _SESSION):
     for perm_name in DEFAULT_PERMS:
         gr = _get_group(perm_name)
         if gr not in defined_perms_groups:
-            log.debug('GR:%s not found, creating permission %s'
-                      % (gr, perm_name))
+            log.debug('GR:%s not found, creating permission %s', gr, perm_name)
             new_perm = _make_perm(perm_name)
             _SESSION().add(new_perm)
     _SESSION().commit()
@@ -127,7 +126,7 @@ def fixups(models, _SESSION):
         ('default_repo_type', 'hg')]:
 
         if skip_existing and get_by_name(models.RhodeCodeSetting, k) is not None:
-            log.debug('Skipping option %s' % k)
+            log.debug('Skipping option %s', k)
             continue
         setting = models.RhodeCodeSetting(k, v)
         _SESSION().add(setting)
diff --git a/rhodecode/lib/dbmigrate/versions/012_version_1_7_0.py b/rhodecode/lib/dbmigrate/versions/012_version_1_7_0.py
--- a/rhodecode/lib/dbmigrate/versions/012_version_1_7_0.py
+++ b/rhodecode/lib/dbmigrate/versions/012_version_1_7_0.py
@@ -99,7 +99,7 @@ def fixups(models, _SESSION):
     perms = models.UserToPerm.query().filter(models.UserToPerm.user == user).all()
     defined_perms_groups = map(_get_group,
                               (x.permission.permission_name for x in perms))
-    log.debug('GOT ALREADY DEFINED:%s' % perms)
+    log.debug('GOT ALREADY DEFINED:%s', perms)
     DEFAULT_PERMS = models.Permission.DEFAULT_USER_PERMISSIONS
 
     # for every default permission that needs to be created, we check if
@@ -107,8 +107,7 @@ def fixups(models, _SESSION):
     for perm_name in DEFAULT_PERMS:
         gr = _get_group(perm_name)
         if gr not in defined_perms_groups:
-            log.debug('GR:%s not found, creating permission %s'
-                      % (gr, perm_name))
+            log.debug('GR:%s not found, creating permission %s', gr, perm_name)
             new_perm = _make_perm(perm_name)
             _SESSION().add(new_perm)
     _SESSION().commit()
diff --git a/rhodecode/lib/diffs.py b/rhodecode/lib/diffs.py
--- a/rhodecode/lib/diffs.py
+++ b/rhodecode/lib/diffs.py
@@ -446,7 +446,7 @@ class DiffProcessor(object):
 
         for chunk in self._diff.chunks():
             head = chunk.header
-            log.debug('parsing diff %r' % head)
+            log.debug('parsing diff %r', head)
 
             raw_diff = chunk.raw
             limited_diff = False
diff --git a/rhodecode/lib/helpers.py b/rhodecode/lib/helpers.py
--- a/rhodecode/lib/helpers.py
+++ b/rhodecode/lib/helpers.py
@@ -1712,14 +1712,14 @@ def process_patterns(text_string, repo_n
     newtext = text_string
 
     for uid, entry in active_entries.items():
-        log.debug('found issue tracker entry with uid %s' % (uid,))
+        log.debug('found issue tracker entry with uid %s', uid)
 
         if not (entry['pat'] and entry['url']):
             log.debug('skipping due to missing data')
             continue
 
-        log.debug('issue tracker entry: uid: `%s` PAT:%s URL:%s PREFIX:%s'
-                  % (uid, entry['pat'], entry['url'], entry['pref']))
+        log.debug('issue tracker entry: uid: `%s` PAT:%s URL:%s PREFIX:%s',
+                  uid, entry['pat'], entry['url'], entry['pref'])
 
         try:
             pattern = re.compile(r'%s' % entry['pat'])
@@ -1741,7 +1741,7 @@ def process_patterns(text_string, repo_n
             link_format=link_format)
 
         newtext = pattern.sub(url_func, newtext)
-        log.debug('processed prefix:uid `%s`' % (uid,))
+        log.debug('processed prefix:uid `%s`', uid)
 
     return newtext, issues_data
 
diff --git a/rhodecode/lib/index/whoosh.py b/rhodecode/lib/index/whoosh.py
--- a/rhodecode/lib/index/whoosh.py
+++ b/rhodecode/lib/index/whoosh.py
@@ -122,7 +122,7 @@ class Search(BaseSearch):
                 search_user, repo_name)
             try:
                 query = qp.parse(safe_unicode(query))
-                log.debug('query: %s (%s)' % (query, repr(query)))
+                log.debug('query: %s (%s)', query, repr(query))
 
                 reverse, sortedby = False, None
                 if search_type == 'message':
@@ -217,8 +217,8 @@ class Search(BaseSearch):
             'path': self.file_schema
         }.get(cur_type, self.file_schema)
 
-        log.debug('IDX: %s' % index_name)
-        log.debug('SCHEMA: %s' % schema_defn)
+        log.debug('IDX: %s', index_name)
+        log.debug('SCHEMA: %s', schema_defn)
         return search_type, index_name, schema_defn
 
     def _init_searcher(self, index_name):
diff --git a/rhodecode/lib/memory_lru_dict.py b/rhodecode/lib/memory_lru_dict.py
--- a/rhodecode/lib/memory_lru_dict.py
+++ b/rhodecode/lib/memory_lru_dict.py
@@ -67,7 +67,7 @@ class LRUDictDebug(LRUDict):
         fmt = '\n'
         for cnt, elem in enumerate(self.keys()):
             fmt += '%s - %s\n' % (cnt+1, safe_str(elem))
-        log.debug('current LRU keys (%s):%s' % (elems_cnt, fmt))
+        log.debug('current LRU keys (%s):%s', elems_cnt, fmt)
 
     def __getitem__(self, key):
         self._report_keys()
diff --git a/rhodecode/lib/middleware/request_wrapper.py b/rhodecode/lib/middleware/request_wrapper.py
--- a/rhodecode/lib/middleware/request_wrapper.py
+++ b/rhodecode/lib/middleware/request_wrapper.py
@@ -44,10 +44,11 @@ class RequestWrapperTween(object):
         finally:
             end = time.time()
             total = end - start
-            log.info('IP: %s Request to %s time: %.3fs [%s]' % (
+            log.info(
+                'IP: %s Request to %s time: %.3fs [%s]',
                 get_ip_addr(request.environ),
                 safe_str(get_access_path(request.environ)), total,
-                get_user_agent(request. environ),)
+                get_user_agent(request. environ)
             )
 
         return response
diff --git a/rhodecode/lib/rc_cache/utils.py b/rhodecode/lib/rc_cache/utils.py
--- a/rhodecode/lib/rc_cache/utils.py
+++ b/rhodecode/lib/rc_cache/utils.py
@@ -237,7 +237,7 @@ class InvalidationContext(object):
                 result = heavy_compute(*args)
 
             compute_time = inv_context_manager.compute_time
-            log.debug('result computed in %.3fs' ,compute_time)
+            log.debug('result computed in %.3fs', compute_time)
 
         # To send global invalidation signal, simply run
         CacheKey.set_invalidate(invalidation_namespace)
diff --git a/rhodecode/lib/rcmail/smtp_mailer.py b/rhodecode/lib/rcmail/smtp_mailer.py
--- a/rhodecode/lib/rcmail/smtp_mailer.py
+++ b/rhodecode/lib/rcmail/smtp_mailer.py
@@ -111,7 +111,7 @@ class SmtpMailer(object):
             smtp_serv.login(self.user, self.passwd)
 
         smtp_serv.sendmail(msg.sender, msg.send_to, raw_msg.as_string())
-        log.info('email sent to: %s' % recipients)
+        log.info('email sent to: %s', recipients)
 
         try:
             smtp_serv.quit()
diff --git a/rhodecode/lib/user_log_filter.py b/rhodecode/lib/user_log_filter.py
--- a/rhodecode/lib/user_log_filter.py
+++ b/rhodecode/lib/user_log_filter.py
@@ -49,13 +49,13 @@ def user_log_filter(user_log, search_ter
     :param user_log:
     :param search_term:
     """
-    log.debug('Initial search term: %r' % search_term)
+    log.debug('Initial search term: %r', search_term)
     qry = None
     if search_term:
         qp = QueryParser('repository', schema=JOURNAL_SCHEMA)
         qp.add_plugin(DateParserPlugin())
         qry = qp.parse(safe_unicode(search_term))
-        log.debug('Filtering using parsed query %r' % qry)
+        log.debug('Filtering using parsed query %r', qry)
 
     def wildcard_handler(col, wc_term):
         if wc_term.startswith('*') and not wc_term.endswith('*'):
@@ -80,7 +80,7 @@ def user_log_filter(user_log, search_ter
             field = getattr(UserLog, 'username')
         else:
             field = getattr(UserLog, field)
-        log.debug('filter field: %s val=>%s' % (field, val))
+        log.debug('filter field: %s val=>%s', field, val)
 
         # sql filtering
         if isinstance(term, query.Wildcard):
diff --git a/rhodecode/lib/utils.py b/rhodecode/lib/utils.py
--- a/rhodecode/lib/utils.py
+++ b/rhodecode/lib/utils.py
@@ -291,8 +291,7 @@ def is_valid_repo_group(repo_group_name,
 
     # check if it's not a repo
     if is_valid_repo(repo_group_name, base_path):
-        log.debug('Repo called %s exist, it is not a valid '
-                  'repo group' % repo_group_name)
+        log.debug('Repo called %s exist, it is not a valid repo group', repo_group_name)
         return False
 
     try:
@@ -300,8 +299,7 @@ def is_valid_repo_group(repo_group_name,
         # since we might match branches/hooks/info/objects or possible
         # other things inside bare git repo
         scm_ = get_scm(os.path.dirname(full_path))
-        log.debug('path: %s is a vcs object:%s, not valid '
-                  'repo group' % (full_path, scm_))
+        log.debug('path: %s is a vcs object:%s, not valid repo group', full_path, scm_)
         return False
     except VCSError:
         pass
@@ -774,5 +772,5 @@ def generate_platform_uuid():
         uuid_list = [platform.platform()]
         return hashlib.sha256(':'.join(uuid_list)).hexdigest()
     except Exception as e:
-        log.error('Failed to generate host uuid: %s' % e)
+        log.error('Failed to generate host uuid: %s', e)
         return 'UNDEFINED'
diff --git a/rhodecode/model/db.py b/rhodecode/model/db.py
--- a/rhodecode/model/db.py
+++ b/rhodecode/model/db.py
@@ -2539,8 +2539,8 @@ class RepoGroup(Base, BaseModel):
                 break
             if cnt == parents_recursion_limit:
                 # this will prevent accidental infinit loops
-                log.error(('more than %s parents found for group %s, stopping '
-                           'recursive parent fetching' % (parents_recursion_limit, self)))
+                log.error('more than %s parents found for group %s, stopping '
+                          'recursive parent fetching', parents_recursion_limit, self)
                 break
 
             groups.insert(0, gr)
diff --git a/rhodecode/model/settings.py b/rhodecode/model/settings.py
--- a/rhodecode/model/settings.py
+++ b/rhodecode/model/settings.py
@@ -241,9 +241,8 @@ class SettingsModel(BaseModel):
                 region.invalidate()
 
             result = _get_all_settings('rhodecode_settings', key)
-            log.debug(
-                'Fetching app settings for key: %s took: %.3fs', key,
-                inv_context_manager.compute_time)
+            log.debug('Fetching app settings for key: %s took: %.3fs', key,
+                      inv_context_manager.compute_time)
 
         return result
 
diff --git a/rhodecode/model/user.py b/rhodecode/model/user.py
--- a/rhodecode/model/user.py
+++ b/rhodecode/model/user.py
@@ -300,11 +300,11 @@ class UserModel(BaseModel):
 
         if updating_user_id:
             log.debug('Checking for existing account in RhodeCode '
-                      'database with user_id `%s` ' % (updating_user_id,))
+                      'database with user_id `%s` ', updating_user_id)
             user = User.get(updating_user_id)
         else:
             log.debug('Checking for existing account in RhodeCode '
-                      'database with username `%s` ' % (username,))
+                      'database with username `%s` ', username)
             user = User.get_by_username(username, case_insensitive=True)
 
         if user is None:
diff --git a/rhodecode/model/user_group.py b/rhodecode/model/user_group.py
--- a/rhodecode/model/user_group.py
+++ b/rhodecode/model/user_group.py
@@ -626,7 +626,7 @@ class UserGroupModel(BaseModel):
                     self.remove_user_from_group(gr, user)
             else:
                 log.debug('Skipping removal from group %s since it is '
-                          'not set to be automatically synchronized' % gr)
+                          'not set to be automatically synchronized', gr)
 
         # now we calculate in which groups user should be == groups params
         owner = User.get_first_super_admin().username
@@ -647,7 +647,7 @@ class UserGroupModel(BaseModel):
                 UserGroupModel().add_user_to_group(existing_group, user)
             else:
                 log.debug('Skipping addition to group %s since it is '
-                          'not set to be automatically synchronized' % gr)
+                          'not set to be automatically synchronized', gr)
 
     def change_groups(self, user, groups):
         """
diff --git a/rhodecode/tests/auth_external_test.py b/rhodecode/tests/auth_external_test.py
--- a/rhodecode/tests/auth_external_test.py
+++ b/rhodecode/tests/auth_external_test.py
@@ -99,8 +99,8 @@ class RhodeCodeAuthPlugin(RhodeCodeExter
                 'extern_type': extern_type,
             }
 
-            log.debug('EXTERNAL user: \n%s' % formatted_json(user_attrs))
-            log.info('user `%s` authenticated correctly' % user_attrs['username'])
+            log.debug('EXTERNAL user: \n%s', formatted_json(user_attrs))
+            log.info('user `%s` authenticated correctly', user_attrs['username'])
 
             return user_attrs
 
diff --git a/rhodecode/tests/scripts/test_concurency.py b/rhodecode/tests/scripts/test_concurency.py
--- a/rhodecode/tests/scripts/test_concurency.py
+++ b/rhodecode/tests/scripts/test_concurency.py
@@ -61,7 +61,7 @@ class Command(object):
         """
 
         command = cmd + ' ' + ' '.join(args)
-        log.debug('Executing %s' % command)
+        log.debug('Executing %s', command)
         if DEBUG:
             print(command)
         p = Popen(command, shell=True, stdout=PIPE, stderr=PIPE, cwd=self.cwd)
diff --git a/rhodecode/tests/vcs_operations/__init__.py b/rhodecode/tests/vcs_operations/__init__.py
--- a/rhodecode/tests/vcs_operations/__init__.py
+++ b/rhodecode/tests/vcs_operations/__init__.py
@@ -57,7 +57,7 @@ class Command(object):
 
         command = cmd + ' ' + ' '.join(args)
         if DEBUG:
-            log.debug('*** CMD %s ***' % (command,))
+            log.debug('*** CMD %s ***', command)
 
         env = dict(os.environ)
         # Delete coverage variables, as they make the test fail for Mercurial
@@ -69,8 +69,8 @@ class Command(object):
                              cwd=self.cwd, env=env)
         stdout, stderr = self.process.communicate()
         if DEBUG:
-            log.debug('STDOUT:%s' % (stdout,))
-            log.debug('STDERR:%s' % (stderr,))
+            log.debug('STDOUT:%s', stdout)
+            log.debug('STDERR:%s', stderr)
         return stdout, stderr
 
     def assert_returncode_success(self):