https://bugzilla.wikimedia.org/show_bug.cgi?id=48628

--- Comment #1 from Tim Landscheidt <t...@tim-landscheidt.de> ---
I wondered what effect multi-hop replication like in LabsDB (production DBs =>
sanitizer => LabsDB) has on Seconds_Behind_Master, and Sean said that for this
reason WMF uses
http://www.percona.com/doc/percona-toolkit/2.2/pt-heartbeat.html.  So a
database function as proposed in this bug should probably query the heartbeat
record instead.

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