add logging for redis clients at start up

services/real-time/app/coffee/DocumentUpdaterController.coffee

@@ -14,6 +14,7 @@ module.exports = DocumentUpdaterController =
 	rclientList: RedisClientManager.createClientList(settings.redis.pubsub, settings.redis.unusedpubsub)
 
 	listenForUpdatesFromDocumentUpdater: (io) ->
+		logger.log {rclients: @rclientList.length}, "listening for applied-ops events"
 		for rclient, i in @rclientList
 			rclient.subscribe "applied-ops"
 			rclient.on "message", (channel, message) ->

services/real-time/app/coffee/RedisClientManager.coffee

@@ -1,7 +1,18 @@
 redis = require("redis-sharelatex")
+logger = require 'logger-sharelatex'
 
 module.exports = RedisClientManager =
     createClientList: (configs...) ->
         # create a dynamic list of redis clients, excluding any configurations which are not defined
-        clientList = (redis.createClient(x) for x in configs when x?)
+        clientList = for x in configs when x?
+            redisType = if x.cluster?
+                "cluster"
+            else if x.sentinels?
+                "sentinel"
+            else if x.host?
+                "single"
+            else
+                "unknown"
+            logger.log {redis: redisType}, "creating redis client"
+            redis.createClient(x)
         return clientList

services/real-time/app/coffee/WebsocketLoadBalancer.coffee

@@ -25,6 +25,8 @@ module.exports = WebsocketLoadBalancer =
 		@emitToRoom "all", message, payload...
 
 	listenForEditorEvents: (io) ->
+		logger.log {rclients: @rclientPubList.length}, "publishing editor events"
+		logger.log {rclients: @rclientSubList.length}, "listening for editor events"
 		for rclientSub in @rclientSubList
 			rclientSub.subscribe "editor-events"
 			rclientSub.on "message", (channel, message) ->