diff --git a/rhodecode/lib/_vendor/jsonlogger/__init__.py b/rhodecode/lib/_vendor/jsonlogger/__init__.py
--- a/rhodecode/lib/_vendor/jsonlogger/__init__.py
+++ b/rhodecode/lib/_vendor/jsonlogger/__init__.py
@@ -11,9 +11,9 @@ import importlib
 from inspect import istraceback
 
 from collections import OrderedDict
-from rhodecode.lib.logging_formatter import _inject_req_id, ExceptionAwareFormatter
-from rhodecode.lib.ext_json import sjson as json
 
+from ...logging_formatter import _inject_req_id, ExceptionAwareFormatter
+from ...ext_json import sjson as json
 
 ZERO = timedelta(0)
 HOUR = timedelta(hours=1)
@@ -78,7 +78,7 @@ class JsonEncoder(json.JSONEncoder):
             return str(obj)
 
         try:
-            return super(JsonEncoder, self).default(obj)
+            return super().default(obj)
 
         except TypeError:
             try:
@@ -194,7 +194,7 @@ class JsonFormatter(ExceptionAwareFormat
 
     def serialize_log_record(self, log_record):
         """Returns the final representation of the log record."""
-        return "%s%s" % (self.prefix, self.jsonify_log_record(log_record))
+        return "{}{}".format(self.prefix, self.jsonify_log_record(log_record))
 
     def format(self, record):
         """Formats a log record and serializes to json"""
diff --git a/rhodecode/lib/_vendor/redis_lock/__init__.py b/rhodecode/lib/_vendor/redis_lock/__init__.py
--- a/rhodecode/lib/_vendor/redis_lock/__init__.py
+++ b/rhodecode/lib/_vendor/redis_lock/__init__.py
@@ -102,7 +102,7 @@ class NotExpirable(RuntimeError):
     pass
 
 
-class Lock(object):
+class Lock:
     """
     A Lock context manager implemented via redis SETNX/BLPOP.
     """
diff --git a/rhodecode/lib/_vendor/statsd/__init__.py b/rhodecode/lib/_vendor/statsd/__init__.py
--- a/rhodecode/lib/_vendor/statsd/__init__.py
+++ b/rhodecode/lib/_vendor/statsd/__init__.py
@@ -1,5 +1,3 @@
-
-
 import logging
 
 from .stream import TCPStatsClient, UnixSocketStatsClient  # noqa
diff --git a/rhodecode/lib/_vendor/statsd/base.py b/rhodecode/lib/_vendor/statsd/base.py
--- a/rhodecode/lib/_vendor/statsd/base.py
+++ b/rhodecode/lib/_vendor/statsd/base.py
@@ -1,5 +1,3 @@
-
-
 import re
 import random
 from collections import deque
@@ -31,7 +29,7 @@ def normalize_tags(tag_list):
     return _normalize_tags_with_cache(tuple(tag_list))
 
 
-class StatsClientBase(object):
+class StatsClientBase:
     """A Base class for various statsd clients."""
 
     def close(self):
@@ -73,7 +71,7 @@ class StatsClientBase(object):
 
     def incr(self, stat, count=1, rate=1, tags=None):
         """Increment a stat by `count`."""
-        self._send_stat(stat, '%s|c' % count, rate, tags)
+        self._send_stat(stat, f'{count}|c', rate, tags)
 
     def decr(self, stat, count=1, rate=1, tags=None):
         """Decrement a stat by `count`."""
@@ -87,18 +85,18 @@ class StatsClientBase(object):
                     return
             with self.pipeline() as pipe:
                 pipe._send_stat(stat, '0|g', 1)
-                pipe._send_stat(stat, '%s|g' % value, 1)
+                pipe._send_stat(stat, f'{value}|g', 1)
         else:
             prefix = '+' if delta and value >= 0 else ''
-            self._send_stat(stat, '%s%s|g' % (prefix, value), rate, tags)
+            self._send_stat(stat, f'{prefix}{value}|g', rate, tags)
 
     def set(self, stat, value, rate=1):
         """Set a set value."""
-        self._send_stat(stat, '%s|s' % value, rate)
+        self._send_stat(stat, f'{value}|s', rate)
 
     def histogram(self, stat, value, rate=1, tags=None):
         """Set a histogram"""
-        self._send_stat(stat, '%s|h' % value, rate, tags)
+        self._send_stat(stat, f'{value}|h', rate, tags)
 
     def _send_stat(self, stat, value, rate, tags=None):
         self._after(self._prepare(stat, value, rate, tags))
@@ -110,10 +108,10 @@ class StatsClientBase(object):
         if rate < 1:
             if random.random() > rate:
                 return
-            value = '%s|@%s' % (value, rate)
+            value = f'{value}|@{rate}'
 
         if self._prefix:
-            stat = '%s.%s' % (self._prefix, stat)
+            stat = f'{self._prefix}.{stat}'
 
         res = '%s:%s%s' % (
             stat,
diff --git a/rhodecode/lib/_vendor/statsd/stream.py b/rhodecode/lib/_vendor/statsd/stream.py
--- a/rhodecode/lib/_vendor/statsd/stream.py
+++ b/rhodecode/lib/_vendor/statsd/stream.py
@@ -1,5 +1,3 @@
-
-
 import socket
 
 from .base import StatsClientBase, PipelineBase
diff --git a/rhodecode/lib/_vendor/statsd/timer.py b/rhodecode/lib/_vendor/statsd/timer.py
--- a/rhodecode/lib/_vendor/statsd/timer.py
+++ b/rhodecode/lib/_vendor/statsd/timer.py
@@ -1,5 +1,3 @@
-
-
 import functools
 from time import perf_counter as time_now
 
@@ -11,7 +9,7 @@ def safe_wraps(wrapper, *args, **kwargs)
     return functools.wraps(wrapper, *args, **kwargs)
 
 
-class Timer(object):
+class Timer:
     """A context manager/decorator for statsd.timing()."""
 
     def __init__(self, client, stat, rate=1, tags=None, use_decimals=True, auto_send=True):
diff --git a/rhodecode/lib/_vendor/statsd/udp.py b/rhodecode/lib/_vendor/statsd/udp.py
--- a/rhodecode/lib/_vendor/statsd/udp.py
+++ b/rhodecode/lib/_vendor/statsd/udp.py
@@ -1,5 +1,3 @@
-
-
 import socket
 
 from .base import StatsClientBase, PipelineBase
@@ -8,7 +6,7 @@ from .base import StatsClientBase, Pipel
 class Pipeline(PipelineBase):
 
     def __init__(self, client):
-        super(Pipeline, self).__init__(client)
+        super().__init__(client)
         self._maxudpsize = client._maxudpsize
 
     def _send(self):
diff --git a/rhodecode/lib/logging_formatter.py b/rhodecode/lib/logging_formatter.py
--- a/rhodecode/lib/logging_formatter.py
+++ b/rhodecode/lib/logging_formatter.py
@@ -141,7 +141,7 @@ class ColorFormatter(ExceptionAwareForma
         """
         Changes record's levelname to use with COLORS enum
         """
-        def_record = super(ColorFormatter, self).format(record)
+        def_record = super().format(record)
 
         levelname = record.levelname
         start = COLOR_SEQ % (COLORS[levelname])