Fix match in nginx_check alarm cluster
diff --git a/nginx/meta/heka.yml b/nginx/meta/heka.yml
index 3e7608a..7d95fe1 100644
--- a/nginx/meta/heka.yml
+++ b/nginx/meta/heka.yml
@@ -36,7 +36,7 @@
       policy: highest_severity
       alerting: enabled_with_notification
       match:
-        service: nginx
+        service: nginx-check
       members:
       - nginx_check
       dimension: