sysmon: Use chromite metrics

BUG=chromium:741082
TEST=None

Change-Id: I3d2ce03430cc9ff8df21ca857002b29b65f9e6df
Reviewed-on: https://chromium-review.googlesource.com/567056
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Tested-by: Allen Li <ayatane@chromium.org>
diff --git a/scripts/sysmon/osinfo_metrics.py b/scripts/sysmon/osinfo_metrics.py
index fb18435..4129e7a 100644
--- a/scripts/sysmon/osinfo_metrics.py
+++ b/scripts/sysmon/osinfo_metrics.py
@@ -11,21 +11,21 @@
 import platform
 import sys
 
-from infra_libs import ts_mon
+from chromite.lib import metrics
 
-_os_name_metric = ts_mon.StringMetric(
+_os_name_metric = metrics.StringMetric(
     'proc/os/name',
     description='OS name on the machine')
 
-_os_version_metric = ts_mon.StringMetric(
+_os_version_metric = metrics.StringMetric(
     'proc/os/version',
     description='OS version on the machine')
 
-_os_arch_metric = ts_mon.StringMetric(
+_os_arch_metric = metrics.StringMetric(
     'proc/os/arch',
     description='OS architecture on this machine')
 
-_python_arch_metric = ts_mon.StringMetric(
+_python_arch_metric = metrics.StringMetric(
     'proc/python/arch',
     description='python userland architecture on this machine')