Histogram buckets should be 1 more than boundaries

[albertored]

Histogram buckets should be 1 more than histogram boundaries. At the moment values greater than the last boundary (let's call it T(n)) are accumulated in the boundary (T(n-1), T(n)] instead of (T(n), +infinity)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3581046) 72.49% compared to head (57b6748) 72.49%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #614   +/-   ##
=======================================
  Coverage   72.49%   72.49%           
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  Files          61       61           
  Lines        1923     1923           
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  Hits         1394     1394           
  Misses        529      529           

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elixir	17.98% <ø> (ø)
erlang	73.79% <ø> (ø)
exporter	66.66% <ø> (ø)
sdk	77.96% <ø> (ø)
zipkin	54.16% <ø> (ø)

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[albertored]

Also, as per the spec it seems that our default boundaries are missing some values (2500, 5000, 7500, 10000), I can add them in this PR

[tsloughter]

Thanks! And yea, the spec changed since this was written.

[albertored]

@tsloughter default boundaries aligned with the specification, it should be ready to be merged

[tsloughter]

Needs a changelog update.

[albertored]

@tsloughter done