sysmon: round cpu % to integer

BUG=chromium:743199
TEST=None

Change-Id: I393cca2ce725ea0d641b1d3809e73a494c541699
Reviewed-on: https://chromium-review.googlesource.com/572360
Tested-by: Aviv Keshet <akeshet@chromium.org>
Trybot-Ready: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Allen Li <ayatane@chromium.org>
diff --git a/scripts/sysmon/proc_metrics.py b/scripts/sysmon/proc_metrics.py
index 9b8dd01..0e4bd88 100644
--- a/scripts/sysmon/proc_metrics.py
+++ b/scripts/sysmon/proc_metrics.py
@@ -93,7 +93,7 @@
     """Finish collection and send metrics."""
     _count_metric.set(self._count, fields=self._fields)
     self._count = 0
-    _cpu_percent_metric.set(self._cpu_percent, fields=self._fields)
+    _cpu_percent_metric.set(int(round(self._cpu_percent)), fields=self._fields)
     self._cpu_percent = 0