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Use APC for caching slave lag times

Authored by aaron.

Description

Use APC for caching slave lag times

Bug: T101433
Change-Id: Ia37ce5a7aca8217ec57cd8d8c5e43472b3d8845b
(cherry picked from commit 9cf6637a751d018bc2bec26ea0f1a9de936c2c9c)