Update reno

Author: MoteHue

releasenotes/notes/radosgw-usage-exporter-behind-haproxy-e4371d2732f2a081.yaml

@@ -1,4 +1,11 @@
 ---
+features:
+  - |
+    The radosgw-usage-exporter is now put behind HAProxy. To facilitate this,
+    ``stackhpc_radosgw_usage_exporter_port`` had been renamed to
+    ``stackhpc_radosgw_usage_exporter_backend_port`` (it remains 9242) and
+    ``stackhpc_radosgw_usage_exporter_frontend_port`` (defaults to 9240) has
+    been introduced.
 fixes:
   - |
     Fixes an issue where object storage metrics were missing from Prometheus by