diff --git a/templates/default/mongo.yaml.erb b/templates/default/mongo.yaml.erb
index ff12b866..cf00897e 100644
--- a/templates/default/mongo.yaml.erb
+++ b/templates/default/mongo.yaml.erb
@@ -14,7 +14,19 @@ instances:
     ssl_certfile: <%= i['ssl_certfile'] %>
     ssl_keyfile: <%= i['ssl_keyfile'] %>
     <% end %>
+    <% if i.key?('additional_metrics') -%>
+    additional_metrics:
+      <% i['additional_metrics'].each do |t| %>
+    - <%= t %>
+      <%end -%>
+    <% end %>
+    <% if i.key?('collections') -%>
+    collections:
+      <% i['collections'].each do |t| %>
+    - <%= t %>
+      <%end -%>
+    <% end %>
   <% end -%>
 
 init_config:
-# No init_config details needed
+# No init_config details needed
\ No newline at end of file