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https://issues.apache.org/jira/browse/CASSANDRA-1380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897452#action_12897452
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Kelley Reynolds commented on CASSANDRA-1380:
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If your entire cluster is dead then yes, you won't be able to access the data 
inside of it but that's only one extreme case under which it's not useful. 
Trended statistics are attractive for much more than just monitoring. You could 
see impending I/O bottlenecks, RF>1 clusters would let you examine behavior 
just before a crash, facilitate debugging and recommendations, and myriad other 
things that other people can think of. Many other systems have stats collectors 
built-in that are used to augment existing monitoring systems and 
troubleshoot/optimize application behavior, I can't think of a reason Cassandra 
should be any different.

> Create a statistics keyspace
> ----------------------------
>
>                 Key: CASSANDRA-1380
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1380
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Kelley Reynolds
>            Priority: Minor
>
> Most significant installations of cassandra have monitoring systems that 
> monitor and trend several key tpstats among other things. Instead of 
> replicating that for each and every installation, it would be useful to have 
> that provided by the core system in a default keyspace. Comprehensive 
> statistics would allow for improved debugging tools, performance 
> recommendations, helpful alerts, introspection, that sort of thing.

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