(bit of a tangent) I like the new generation of metric database, but are there systems that allow for true distributed deployments? E.g. where some machines mi

(bit of a tangent) I like the new generation of metric database, but are there systems that allow for true distributed deployments? E.g. where some machines might be offline for a few days, and need to sync (send some/receive some) metrics with other machines when back online?