Fix debug loop, add notes for #[tokio::test]

[TommyCpp]

fixes #536 #550

[codecov]

Codecov Report

Merging #552 (9a434e4) into main (88e779d) will increase coverage by 2.3%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main    #552     +/-   ##
=======================================
+ Coverage   52.2%   54.5%   +2.3%     
=======================================
  Files         96      97      +1     
  Lines       8506    8534     +28     
=======================================
+ Hits        4447    4659    +212     
+ Misses      4059    3875    -184     

Impacted Files	Coverage Δ
opentelemetry/src/lib.rs	100.0% <ø> (ø)
opentelemetry/src/sdk/metrics/mod.rs	18.6% <100.0%> (+18.6%)	⬆️
opentelemetry/src/sdk/trace/span_processor.rs	81.4% <0.0%> (-0.1%)	⬇️
opentelemetry/src/metrics/counter.rs	100.0% <0.0%> (ø)
opentelemetry/src/global/trace.rs	15.6% <0.0%> (+0.2%)	⬆️
opentelemetry/src/sdk/export/metrics/mod.rs	1.1% <0.0%> (+1.1%)	⬆️
opentelemetry/src/metrics/number.rs	44.5% <0.0%> (+3.6%)	⬆️
opentelemetry/src/sdk/metrics/selectors/simple.rs	4.3% <0.0%> (+4.3%)	⬆️
opentelemetry/src/sdk/resource.rs	78.7% <0.0%> (+4.6%)	⬆️
opentelemetry/src/util.rs	27.7% <0.0%> (+11.1%)	⬆️
... and 8 more

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