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/git_metrics.py b/scripts/sysmon/git_metrics.py
index bcf8dea..aa1f50e 100644
--- a/scripts/sysmon/git_metrics.py
+++ b/scripts/sysmon/git_metrics.py
@@ -11,7 +11,7 @@
 import subprocess
 
 from chromite.lib import cros_logging as logging
-from infra_libs import ts_mon
+from chromite.lib import metrics
 
 logger = logging.getLogger(__name__)
 
@@ -63,15 +63,15 @@
   `metric_path` is the Monarch metric path to report to.
   """
 
-  _commit_hash_metric = ts_mon.StringMetric(
+  _commit_hash_metric = metrics.StringMetric(
       'git/hash',
       description='Current Git commit hash.')
 
-  _timestamp_metric = ts_mon.GaugeMetric(
+  _timestamp_metric = metrics.GaugeMetric(
       'git/timestamp',
       description='Current Git commit time as seconds since Unix Epoch.')
 
-  _unstaged_changes_metric = ts_mon.GaugeMetric(
+  _unstaged_changes_metric = metrics.GaugeMetric(
       'git/unstaged_changes',
       description='Unstaged Git changes.')