diff --git a/doc/source/plugins/implementation/context_plugin.rst b/doc/source/plugins/implementation/context_plugin.rst
index 13f8c829..166b0dfa 100644
--- a/doc/source/plugins/implementation/context_plugin.rst
+++ b/doc/source/plugins/implementation/context_plugin.rst
@@ -84,7 +84,7 @@ implement the Context API: the *setup()* method that creates a flavor and the
                     ram=self.config.get("ram", 1),
                     vcpus=self.config.get("vcpus", 1),
                     disk=self.config.get("disk", 1)).to_dict()
-                LOG.debug("Flavor with id '%s'", self.context["flavor"]["id"])
+                LOG.debug("Flavor with id '%s'" % self.context["flavor"]["id"])
             except Exception as e:
                 msg = "Can't create flavor: %s" % e.message
                 if logging.is_debug():
@@ -97,7 +97,7 @@ implement the Context API: the *setup()* method that creates a flavor and the
             try:
                 nova = osclients.Clients(self.context["admin"]["credential"]).nova()
                 nova.flavors.delete(self.context["flavor"]["id"])
-                LOG.debug("Flavor '%s' deleted", self.context["flavor"]["id"])
+                LOG.debug("Flavor '%s' deleted" % self.context["flavor"]["id"])
             except Exception as e:
                 msg = "Can't delete flavor: %s" % e.message
                 if logging.is_debug():
diff --git a/doc/source/plugins/implementation/sla_plugin.rst b/doc/source/plugins/implementation/sla_plugin.rst
index 86c5cba0..5b42994a 100644
--- a/doc/source/plugins/implementation/sla_plugin.rst
+++ b/doc/source/plugins/implementation/sla_plugin.rst
@@ -32,7 +32,6 @@ Inherit a class for your plugin from the base *SLA* class and implement its API
 .. code-block:: python
 
     from rally.task import sla
-    from rally.common.i18n import _
 
     @sla.configure(name="max_duration_range")
     class MaxDurationRange(sla.SLA):
@@ -62,8 +61,8 @@ Inherit a class for your plugin from the base *SLA* class and implement its API
             return self.success
 
         def details(self):
-            return (_("%s - Maximum allowed duration range: %.2f%% <= %.2f%%") %
-                    (self.status(), self._max - self._min, self.criterion_value))
+            return ("%s - Maximum allowed duration range: %.2f%% <= %.2f%%"
+                     % (self.status(), self._max - self._min, self.criterion_value))
 
 
 Usage
diff --git a/tests/ci/sync_requirements.py b/tests/ci/sync_requirements.py
index ed0fecab..641cebc9 100644
--- a/tests/ci/sync_requirements.py
+++ b/tests/ci/sync_requirements.py
@@ -243,7 +243,7 @@ def _read_requirements():
     """Read all rally requirements."""
     LOG.info("Reading rally requirements...")
     for file_name in RALLY_REQUIREMENTS_FILES:
-        LOG.debug("Try to read '%s'.", file_name)
+        LOG.debug("Try to read '%s'." % file_name)
         with open(file_name) as f:
             data = f.read()
         LOG.info("Parsing requirements from %s." % file_name)
@@ -263,7 +263,7 @@ def _sync():
     LOG.info("Obtaining global-requirements...")
     for i in range(0, len(GLOBAL_REQUIREMENTS_LOCATIONS)):
         url = GLOBAL_REQUIREMENTS_LOCATIONS[i] + GLOBAL_REQUIREMENTS_FILENAME
-        LOG.debug("Try to obtain global-requirements from %s", url)
+        LOG.debug("Try to obtain global-requirements from %s" % url)
         try:
             raw_gr = requests.get(url).text
         except requests.ConnectionError as e:
@@ -309,7 +309,7 @@ def format_requirements():
 def add_uppers():
     """Obtains latest version of packages and put them to requirements."""
     for filename, requirements in _sync():
-        LOG.info("Obtaining latest versions of packages for %s.", filename)
+        LOG.info("Obtaining latest versions of packages for %s." % filename)
         for req in requirements:
             if isinstance(req, Requirement):
                 if isinstance(req.version, dict) and not req.version["max"]: