To fix a locale issue

unix.py.diff

diff --git a/checks/system/unix.py b/checks/system/unix.py
index 5ebc6b2..8be6c5c 100644
--- a/checks/system/unix.py
+++ b/checks/system/unix.py
@@ -626,7 +626,7 @@ class Cpu(Check):
         def get_value(legend, data, name):
             "Using the legend and a metric name, get the value or None from the data line"
             if name in legend:
-                return float(data[legend.index(name)])
+                return float(data[legend.index(name)].replace(",", "."))
             else:
                 # FIXME return a float or False, would trigger type error if not python
                 self.logger.debug("Cannot extract cpu value %s from %s (%s)" % (name, data, legend))

To apply this patch:

# get the file into your home directory
cd /usr/share/datadog/agent
sudo  patch -p1 < ~/unix.py.diff
sudo service datadog-agent restart