Cherry-pick #12458 to 7.2: [Heartbeat] Fix Continuation Dispatch / mode: all pings #12477
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Cherry-pick of PR #12458 to 7.2 branch. Original message:
Currently mode: all pings are broken. The root cause is that the scheduler dispatch of continuations in the heartbeat task model is broken. Since the only current use of this is
mode:all
pings that is what is affected. The issue was incorrectly aliasing variables when dispatching future work.This patch also renames some of the related variables to make understanding the code here simpler.
This issue is well described on this wiki page https://github.com/golang/go/wiki/CommonMistakes