Commits on Nov 27, 2023

1. streamingccl: replace replication lag metric with a replicated time m… …

   …etric
   
   This patch removes the replication lag metric and dbconsole graph as it's wrong
   if more than one replication stream is running, if the job coordinator moves,
   or if the job is paused.
   
   This patch adds the `physical_replication.replicated_time_seconds` metric which
   tracks the replicated time as seconds since the unix epoch. The metric uses
   seconds instead of nanos because the the `time()` prom function returns the
   seconds since the unix epoch, allowing users to easily alert if
   `time()-physical_replication.replicated_time_seconds` is too large.
   
   Lastly, this patch removes 2 c2c metrics that seemed useless.
   
   Informs #113951
   
   Release note (ui change): this patch remotes the
   `physical_replication.frontier_lag_nanos` metric and dbconsole graph is it's
   sometimes wrong. This patch adds `physical_replication.replicated_time_seconds`
   metric which users may use for alerting.

   

   msbutler committed Nov 27, 2023
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