Add gainsight to the prometheus init state

Change-Id: I17f5e52871cdf8a3bbb99847654520e87dfbac34
Related-To: PROD-35929
diff --git a/prometheus/init.sls b/prometheus/init.sls
index 08f7654..67ecf0e 100644
--- a/prometheus/init.sls
+++ b/prometheus/init.sls
@@ -27,4 +27,7 @@
   {%- if pillar.prometheus.exporters is defined %}
   - prometheus.exporters
   {%- endif %}
+  {%- if pillar.prometheus.gainsight is defined %}
+  - prometheus.gainsight
+  {%- endif %}
 {%- endif %}