mcilwain bb67841884 Add metrics for async batch operation processing ... We want to know how long it's actually taking to process asynchronous contact/host deletions and DNS refreshes on host renames. This adds instrumentation. Five metrics are recorded as follows: * An incrementable metric for each async task processed (split out by type of task and result). * Two event metrics for processing time between when a task is enqueued and when it is processed -- tracked separately for contact/host deletion and DNS refresh on host rename. * Two event metrics for batch size every time the two mapreduces are run (this is usually 0). Tracked separately for contact/host deletion and DNS refresh on host rename. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=157001310		2017-06-05 18:17:09 -04:00
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metrics	Add metrics for async batch operation processing	2017-06-05 18:17:09 -04:00
whitebox	Automated g4 rollback of changelist 156106183.	2017-05-17 15:19:10 -04:00