Commits on Jun 25, 2019

1. Introduce optional memory ballast …

   This change add an optional memory ballast to help with ease GC pressure
   in high thoughput scenarios
   
   - Added new CLI flag called `--mem-ballast-size-mib` which represents
   the size of memory ballast to use in MiB. Omitting the value or setting
   it to zero does not set the ballast.
   
   - Updated process telemetry code to account for the ballast and report
   memory usage statistics after subtracting the ballast size. I'm not sure
   if this makes sense in every scenario. If not, we can add another flag
   to disable the behaviour. Another option is to add one more metric that
   just exports the memory ballast size as a static number and then let
   metric consumers to adjust the numbers.
   
   https://blog.twitch.tv/go-memory-ballast-how-i-learnt-to-stop-worrying-and-love-the-heap-26c2462549a2
   
   golang/go#23044

   

   owais committed Jun 25, 2019
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