Track max buffer usage in memory channel statistics - #3474

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00000%. Comparing base (3769b07) to head (0a8797f).

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  Files             128          128           
  Lines           19449        19458    +9     
  Branches         1320         1320           
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+ Hits            19449        19458    +9     

@pctablet505 One suggestion: I get that the "used" bit of max_buffer_used is you trying to be explicit about the meaning, but I'd still expect this name to confuse people. max_anything sounds like a configured limit rather than a metric. I'd suggest something like peak_buffer or peak_buffer_used.

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