C. Scott Andreas updated CASSANDRA-3858:
    Component/s: Metrics

> expose "propagation delay" metric in JMX
> ----------------------------------------
>                 Key: CASSANDRA-3858
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3858
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Metrics
>            Reporter: Peter Schuller
>            Priority: Minor
> My idea is to augment the gossip protocol to contain timestamps. We wouldn't 
> use the timestamps for anything "important", but we could use them to allow 
> each node to expose a number which is the number of milliseconds (or seconds) 
> "old" information is about nodes that are "the oldest" and also alive.
> When nodes go down you'd see spikes, but for most cases where nodes live, 
> this information should give you a pretty good idea of how fast gossip 
> information is propagating through the cluster, assuming you keep your clocks 
> in synch.
> It should be a good thing to have graphed, and to have alerts on.

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