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123510: ui: fix replication lag metric for multinode clusters and cutover r=msbutler a=kev-cao Replication lag metric would report absurdly high lag for multinode clusters as it would take the average of the reported timestamps, and as some nodes may report 0, this would cause extremely low replicated times. To resolve this, the metric should pick the maximum time reported by all of the nodes. Additionally, on cutover or job fail/cancellation, replicated time has stopped being reported to avoid falsely reporting high replication lag. Informs #120652 Release note (ui change): fix replication lag metric reporting for multinode clusters and cutover Co-authored-by: Kevin Cao <kevin.cao@cockroachlabs.com>
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