[VOL-3255] enhancement to support device metrics

Change-Id: Ic26c2db30a58943a4eef6276ae1cf40350d51702
diff --git a/vendor/github.com/prometheus/procfs/.gitignore b/vendor/github.com/prometheus/procfs/.gitignore
new file mode 100644
index 0000000..25e3659
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/.gitignore
@@ -0,0 +1 @@
+/fixtures/