feat(plugin-http): add example

[OlivierAlbertini]

Which problem is this PR solving?

• closes examples: provide an example for HTTP plugin #245

Short description of the changes

• Provides this example in order to facilitate testing for people that would like to play around.
• See comments (where I'm facing to some situations, I will create issues).

I will remove the draft status once PRs will be merged:

• fix(plugin-http): improve formatting for url attribute #317
• fix: change options to config based on BasePlugin #314
• fix: pluginLoader for core modules #312
• feat(exporter-jaeger): add forceFlush and timeout options #301
• feat(node-sdk): make config optional #331
  PR to merge:
• fix: dont trace ourselves #335
• Add flush interval for Jaeger exporter #340
  TODO:
• add BatchSpanProcessor for Zipkin

Working with Zipkin

See Files changed section (image)
And below attributes:

Working with Jaeger

[mayurkale22]

Nice!

[mayurkale22]

s/exporter/processor/g ?

[mayurkale22]

Also, I think we should use BatchSpanProcessor in case of Zipkin exporter (dependency on #238). Jaeger library has its own batching mechanism, so it makes sense to use SimpleSpanProcessor with Jaeger exporter.

[mayurkale22]

@OlivierAlbertini Looks like all the dependent PRs are merged, Could you please change this to Ready to Review.

[mayurkale22]

Not working with Jaeger (don't see spans in Jaeger UI) Do I need to tweak the exporter config ?

I will give it a try on Jaeger exporter.

[mayurkale22]

@OlivierAlbertini If you want, you can use this image for the Jaeger exporter example. I did some hacking to generate this with your example. I will add agenda for tomorrow's SIG meeting to discuss about this.

[codecov-io]

Codecov Report

Merging #318 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #318      +/-   ##
========================================
+ Coverage   97.97%    98%   +0.02%     
========================================
  Files         101    101              
  Lines        4891   4912      +21     
  Branches      413    415       +2     
========================================
+ Hits         4792   4814      +22     
+ Misses         99     98       -1

Impacted Files	Coverage Δ
...telemetry-scope-base/test/NoopScopeManager.test.ts	100% <0%> (ø)	⬆️
...ages/opentelemetry-plugin-http/test/utils/Utils.ts	50% <0%> (+21.42%)	⬆️

[mayurkale22]

Ping, for more reviews.

[mayurkale22]

@OlivierAlbertini Thanks for the example. #335 and #340 are not a real blocker for this one and let's keep SimpleSpanProcessor for this example to see the immediate export.