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Hi Rajnish,
You can find a history of recent changes to your sharded cluster in the config.changelog collection. The changelog is a capped collection containing up to 10MB of changes to your sharded cluster metadata. Note that the config database is reserved for internal use by MongoDB, so you should not modify or depend on the format of this data.
Please also note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion or questions such as this, please post on the mongodb-users group (http://groups.google.com/group/mongodb-user) or Stack Overflow with the mongodb tag.
Thanks,
Stephen
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