feat(exporters): update proto version and use otlp-transformer

[pichlermarc]

Which problem is this PR solving?

The proto version was outdated, which causes problems with newer collector versions. This PR updates the proto version to 0.16, and makes use of the otlp-transformer package introduced in #2746.

Fixes #2886, #2675

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Export will stop working for receivers that are using old OTLP versions.
• This change requires a documentation update

How Has This Been Tested?

• Adapted unit tests
• Added unit tests

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

Merging #2929 (052eabb) into main (65aeff0) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2929      +/-   ##
==========================================
- Coverage   92.97%   92.88%   -0.09%     
==========================================
  Files         185      182       -3     
  Lines        6089     5906     -183     
  Branches     1304     1253      -51     
==========================================
- Hits         5661     5486     -175     
+ Misses        428      420       -8     

Impacted Files	Coverage Δ
...er-metrics-otlp-http/src/OTLPMetricExporterBase.ts	57.14% <ø> (ø)
...tal/packages/otlp-transformer/src/metrics/types.ts	100.00% <ø> (ø)
...ental/packages/otlp-transformer/src/trace/types.ts	100.00% <ø> (ø)
.../exporter-trace-otlp-grpc/src/OTLPTraceExporter.ts	100.00% <100.00%> (ø)
...e-otlp-http/src/platform/node/OTLPTraceExporter.ts	100.00% <100.00%> (ø)
...exporter-trace-otlp-proto/src/OTLPTraceExporter.ts	100.00% <100.00%> (ø)
...porter-metrics-otlp-grpc/src/OTLPMetricExporter.ts	100.00% <100.00%> (ø)
...-otlp-http/src/platform/node/OTLPMetricExporter.ts	100.00% <100.00%> (ø)
...orter-metrics-otlp-proto/src/OTLPMetricExporter.ts	100.00% <100.00%> (ø)
...tal/packages/otlp-transformer/src/metrics/index.ts	100.00% <100.00%> (ø)
... and 4 more

[vmarchaud]

overall lgtm, did you test with the collector ? if so, with which version of the collector ? I believe we need to update the readme for it to have a minimal compatible version, WDYT ?

[pichlermarc]

overall lgtm, did you test with the collector ? if so, with which version of the collector ? I believe we need to update the readme for it to have a minimal compatible version, WDYT ?

I did test it with 0.49 (latest version) with oltp-http-json and otlp-http-proto. I will try it out grpc as well.
Having a minimum version in the readme is a good idea. I'm going to try out different versions, and will update the readme with a minimum once I found out which one that is. 🙂

[blumamir]

LGTM.
left few minors about naming (instrumentationLibrary -> instrumentationScope), and about the fact that this PR will drop support for old collectors in OTLP-JSON.

Thanks for doing this important work

[pichlermarc]

@vmarchaud I updated the READMEs to include minimum and maximum tested versions. 🙂

I found that with these updates

• http/json will be compatible with >=0.48 up to 0.50 (latest)
• http/proto will be compatible with >=0.32 up to 0.50 (latest)
• grpc will be compatible with >=0.16 up to 0.50 (latest)

for both traces and metrics.

[blumamir]

LGTM. There are few open discussions and nits but they are not blockers.

[legendecas]

Overall LGTM. Just a few nits.

[dyladan]

Once @legendecas's nit is resolved this can be merged IMO

[legendecas]

This is a great job. Thank you!