More details on callbacks

[benblack86]

Adding more details about the different callback implementations.

@DanSimon @aliyakamercan @dxuhuang @nsauro @jlbelmonte @amotamed

[codecov-io]

Codecov Report

Merging #592 into develop will decrease coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           develop    #592      +/-   ##
==========================================
- Coverage    84.94%   84.9%   -0.05%     
==========================================
  Files           99      99              
  Lines         4431    4431              
  Branches       378     378              
==========================================
- Hits          3764    3762       -2     
- Misses         667     669       +2

Impacted Files	Coverage Δ
...sus/src/main/scala/colossus/service/Callback.scala	88.37% <ø> (ø)	:arrow_up:
...s/src/main/scala/colossus/metrics/Collection.scala	97.43% <0%> (-2.57%)	:arrow_down:
.../scala/colossus/metrics/collectors/Histogram.scala	90.57% <0%> (-0.73%)	:arrow_down:

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[aliyakamercan]

👍