From c5a09fcf0a78fe6adae0744cd1dfb9eefe5abf93 Mon Sep 17 00:00:00 2001
From: Brian Gough <brian.gough@overleaf.com>
Date: Fri, 22 Mar 2019 11:18:34 +0000
Subject: [PATCH] add comment about downsampling

---
 services/real-time/app/coffee/EventLogger.coffee | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/services/real-time/app/coffee/EventLogger.coffee b/services/real-time/app/coffee/EventLogger.coffee
index 1852f0d03d..bab9dbaa8c 100644
--- a/services/real-time/app/coffee/EventLogger.coffee
+++ b/services/real-time/app/coffee/EventLogger.coffee
@@ -22,7 +22,7 @@ module.exports = EventLogger =
 		# store the last count in a hash for each host
 		previous = EventLogger._storeEventCount(key, count)
 		if !previous? || count == (previous + 1)
-			metrics.inc "event.#{channel}.valid", 0.001
+			metrics.inc "event.#{channel}.valid", 0.001 # downsample high rate docupdater events
 			return # order is ok
 		if (count == previous)
 			metrics.inc "event.#{channel}.duplicate"