Update

syntax/modules/rrd-graph.vim

@@ -0,0 +1,9 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'nginx') == -1
+  
+" RRD Graph Module <https://www.nginx.com/resources/wiki/modules/rrd_graph/>
+" This module provides an HTTP interface to RRDtool's graphing facilities.
+syn keyword ngxDirectiveThirdParty rrd_graph
+syn keyword ngxDirectiveThirdParty rrd_graph_root
+
+
+endif