Update

syntax/modules/fair-balancer.vim

@@ -0,0 +1,9 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'nginx') == -1
+  
+" Upstream Fair Balancer <https://www.nginx.com/resources/wiki/modules/fair_balancer/>
+" Sends an incoming request to the least-busy backend server, rather than distributing requests round-robin.
+syn keyword ngxDirectiveThirdParty fair
+syn keyword ngxDirectiveThirdParty upstream_fair_shm_size
+
+
+endif