Added instrumentation for selected operations.

[cableramki]

No description provided.

[codecov-io]

Codecov Report

Merging #78 into master will increase coverage by 0.54%.
The diff coverage is 56.25%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   63.54%   64.08%   +0.54%     
==========================================
  Files           9        9              
  Lines         716      724       +8     
  Branches      123      123              
==========================================
+ Hits          455      464       +9     
+ Misses        160      158       -2     
- Partials      101      102       +1

Impacted Files	Coverage Δ
src/scheduler.c	6.73% <0%> (+0.18%)	⬆️
src/process_data.c	64.4% <100%> (+2.58%)	⬆️
src/time.c	35.71% <71.42%> (+35.71%)	⬆️

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