[k8s-checker] Fix tags for pod metrics

Bug: skia:10543
Change-Id: Ieadc7e631d40ce457c735d10e9fae1fb168074d6
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/306816
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
diff --git a/k8s-checker/go/k8s-checker/main.go b/k8s-checker/go/k8s-checker/main.go
index 885ecd4..6f63e02 100644
--- a/k8s-checker/go/k8s-checker/main.go
+++ b/k8s-checker/go/k8s-checker/main.go
@@ -109,12 +109,10 @@
 	for _, p := range pods.Items {
 		for _, c := range p.Status.ContainerStatuses {
 			tags := map[string]string{
+				"app":       p.Labels["app"],
 				"pod":       p.ObjectMeta.Name,
 				"container": c.Name,
 			}
-			if app, ok := p.Labels["app"]; ok {
-				tags["app"] = app
-			}
 			restarts := metrics2.GetInt64Metric(POD_RESTART_COUNT_METRIC, tags)
 			restarts.Update(int64(c.RestartCount))
 			metrics[restarts] = struct{}{}