[net/http] enhance otelhttp example to support metric

[fatsheep9146]

Signed-off-by: Ziqi Zhao [email protected]

The current otelhttp example only contains the logic of traces, I added the support of metric.

[dmathieu]

The metrics SDK is currently under heavy revamping to be moved out of beta (see the new_sdk branch). I think this kind of change should wait for that work to be finished.

[fatsheep9146]

@dmathieu @MrAlias Already update to latest metric sdk, please help review this again, thanks!

[fatsheep9146]

All comments are resolved @MrAlias

[codecov[bot]]

Codecov Report

Merging #2610 (73f5f3c) into main (e97d789) will increase coverage by 0.0%. The diff coverage is 89.4%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2610   +/-   ##
=====================================
  Coverage   69.6%   69.6%           
=====================================
  Files        147     147           
  Lines       6785    6795   +10     
=====================================
+ Hits        4725    4735   +10     
  Misses      1944    1944           
  Partials     116     116           

Impacted Files	Coverage Δ
samplers/jaegerremote/sampler_remote.go	87.4% <50.0%> (ø)
instrumentation/net/http/otelhttp/handler.go	81.9% <100.0%> (+0.5%)	:arrow_up:
samplers/jaegerremote/sampler_remote_options.go	100.0% <100.0%> (ø)

[fatsheep9146]

the failed check seems to be flaky, could you trigger this again? @dmathieu @MrAlias