SLING-5328 : add missing documentation

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1716180 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/resources/OSGI-INF/metatype/metatype.properties b/src/main/resources/OSGI-INF/metatype/metatype.properties
index de9301f..c924425 100644
--- a/src/main/resources/OSGI-INF/metatype/metatype.properties
+++ b/src/main/resources/OSGI-INF/metatype/metatype.properties
@@ -37,6 +37,24 @@
  discoveryLite descriptor should be checked for changes. Default is 2 seconds. \
  Note that the timeout value is configured within Oak directly.
 
+clusterSyncServiceTimeout.name = SyncService timeout (seconds)
+clusterSyncServiceTimeout.description = Configure the timeout (in seconds) after which \
+ the SyncService gives up when it did not see sync tokens of peer instances in the cluster. \
+ The SyncService mechanism ensures switching to a new topology is handled synchronously \
+ in the cluster and if this timeout is hit, there is a risk of an instance not having \
+ noticed a new topology just yet. Default is 120 seconds.
+ 
+clusterSyncServiceInterval.name = SyncService interval (seconds)
+clusterSyncServiceInterval.description = Configure the interval (in seconds) at which \
+ the SyncService checks for sync tokens or their timeout. Default is 2 seconds.
+ 
+enableSyncToken.name = Enable the SyncService
+enableSyncToken.description = When enabled, the SyncService that exchanges sync tokens \
+ upon every topology change is used. The SyncService ensures that a topology change event \
+ is only sent once all instances have indicated they are aware of the ongoing change. \
+ Disabling this results in the topology change events being sent out quicker, however \
+ without a synchronization guarantee.
+
 minEventDelay.name = Minimal Event Delay (seconds)
 minEventDelay.description = Configure a minimal delay (in seconds) between TOPOLOGY_CHANGING \
  and TOPOLOGY_CHANGED. Any further changes happening during this delay are accumulated and \