feat: Added OTEL TracerProvider instead of opentracing.Tracer for hotROD example app service (Redis)

[afzal442]

Which problem is this PR solving?

• Related to Upgrade HotROD example to use OpenTelemetry SDK #3380
• Part of Upgrade internal use of tracing to OpenTelemetry #3381

• This adds OTEL tracerProvider and removes OT tracer for Redis service hotROD app

Before:

After:

[afzal442]

Hi there, currently, it is out of parent context maybe due to spanID. I am not sure why. on it.

Update: Redis spans seem to work fine. Previously, it had an issue with instrumenting the layers in a redis service.

[yurishkuro]

Just tested this PR as is - it's a good sign that Redis spans appear to work just fine with the rest of the trace. Should make this easier when we migrate the main Jaeger code base.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 🎉

Comparison is base (bfed6e7) 97.05% compared to head (7bae608) 97.07%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4533      +/-   ##
==========================================
+ Coverage   97.05%   97.07%   +0.01%     
==========================================
  Files         301      301              
  Lines       17817    17817              
==========================================
+ Hits        17292    17295       +3     
+ Misses        421      419       -2     
+ Partials      104      103       -1     

Flag	Coverage Δ
unittests	97.07% <ø> (+0.01%)	⬆️

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see 1 file with indirect coverage changes

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[yurishkuro]

I briefly checked the blog post, and I don't think there is an issue with baggage specifically for the redis service, but it may come up in the future changes. So this PR is ok to merge.

[yurishkuro]

What would be nice is if we had an integration test for HotROD that was validating all the points being made in the blog post.