Fix log_collector in StackLight models

Change-Id: I7be3a7d42e34682e875e337ea16829af66802acb
diff --git a/classes/cluster/sl_k8s_calico/stacklight/init.yml b/classes/cluster/sl_k8s_calico/stacklight/init.yml
index 6df9960..3237575 100644
--- a/classes/cluster/sl_k8s_calico/stacklight/init.yml
+++ b/classes/cluster/sl_k8s_calico/stacklight/init.yml
@@ -1,5 +1,8 @@
 classes:
+- service.grafana.collector
 - system.linux.system.repo.mcp.extra
+- system.heka.log_collector.single
+- system.heka.log_collector.output.telegraf
 - system.prometheus.collector
 - system.telegraf.agent
 parameters: