Remove old OTLP exporter

[Aneurysm9]

No description provided.

[codecov]

Codecov Report

Merging #1990 (cef95b9) into main (7728a52) will decrease coverage by 1.9%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main   #1990     +/-   ##
=======================================
- Coverage   77.3%   75.3%   -2.0%     
=======================================
  Files        162     143     -19     
  Lines       8495    6896   -1599     
=======================================
- Hits        6567    5194   -1373     
+ Misses      1678    1495    -183     
+ Partials     250     207     -43     

Impacted Files	Coverage Δ
sdk/metric/refcount_mapped.go	77.7% <0.0%> (-22.3%)	⬇️
sdk/metric/sdk.go	80.2% <0.0%> (-1.2%)	⬇️

[tonistiigi]

Was it expected that this removed support for http/json that is not part of #1963? I don't see this mentioned in the changelog and according to #1122 it is a spec requirement.

[MrAlias]

Was it expected that this removed support for http/json that is not part of #1963? I don't see this mentioned in the changelog and according to #1122 it is a spec requirement.

It was. You can find more context here: #1924

Regarding the specification, the stable release that we are implementing ended up only requiring one of the three listed protocol/transport pairs. We dropped support for HTTP/JSON because our implementation was incorrect.