Show benchmarks for metrics between gogo/handwritten/google_protobuf

[bogdandrutu]

And if anyone is interested why, it is mostly that gogoproto has some missing optimizations that I applied. Here are some examples:

1. For the oneof (see https://github.com/open-telemetry/opentelemetry-collector/blob/main/pdata/internal/data/protogen/metrics/v1/metrics.pb.go#L2307) they don't call the MarshalToSized which leads to 2 extra Size() calls.
2. Another big one is about how they marshal packed (repeated (slice) scalars that are represented as variants (not fixed) ), see https://github.com/open-telemetry/opentelemetry-collector/blob/main/pdata/internal/data/protogen/metrics/v1/metrics.pb.go#L3114. Here they can simply start from last element and call encodeVariant.

goos: darwin
goarch: arm64
pkg: go.opentelemetry.io/collector/pdata/pmetric
cpu: Apple M2 Max
BenchmarkMetricsProtoMarshal-12                   235209              5124 ns/op            6144 B/op          1 allocs/op
BenchmarkMetricsProtoMarshalNew-12                320055              3529 ns/op            6144 B/op          1 allocs/op
BenchmarkMetricsProtoMarshalGoProtobuf-12          37998             31246 ns/op            6144 B/op          1 allocs/op
BenchmarkMetricsProtoUnmarshal-12                  66105             18018 ns/op           36217 B/op        908 allocs/op
BenchmarkMetricsProtoUnmarshalNew-12               66057             18026 ns/op           36217 B/op        908 allocs/op
BenchmarkMetricsProtoUnmarshalGoProtobuf-12        26983             44656 ns/op           50777 B/op        911 allocs/op

[codecov]

Codecov Report

❌ Patch coverage is 19.51220% with 2937 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.86%. Comparing base (10fd06d) to head (e423f09).
⚠️ Report is 67 commits behind head on main.

Files with missing lines	Patch %	Lines
pdata/internal/generated_wrapper_profile.go	5.67%	182 Missing and 1 partial ⚠️
pdata/internal/generated_wrapper_span.go	5.88%	175 Missing and 1 partial ⚠️
...generated_wrapper_exponentialhistogramdatapoint.go	6.62%	154 Missing and 1 partial ⚠️
...a/internal/generated_wrapper_histogramdatapoint.go	7.59%	145 Missing and 1 partial ⚠️
pdata/internal/generated_wrapper_logrecord.go	8.14%	123 Missing and 1 partial ⚠️
pdata/internal/generated_wrapper_mapping.go	9.75%	110 Missing and 1 partial ⚠️
pdata/internal/generated_wrapper_sample.go	10.81%	98 Missing and 1 partial ⚠️
...a/internal/generated_wrapper_profilesdictionary.go	12.00%	87 Missing and 1 partial ⚠️
...ata/internal/generated_wrapper_summarydatapoint.go	12.50%	83 Missing and 1 partial ⚠️
pdata/internal/proto/unmarshal.go	16.66%	71 Missing and 4 partials ⚠️
... and 45 more

❌ Your patch check has failed because the patch coverage (19.51%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (85.86%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (10fd06d) and HEAD (e423f09). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (10fd06d)	HEAD (e423f09)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13602      +/-   ##
==========================================
- Coverage   92.78%   85.86%   -6.93%     
==========================================
  Files         630      631       +1     
  Lines       35515    39018    +3503     
==========================================
+ Hits        32953    33502     +549     
- Misses       2018     4911    +2893     
- Partials      544      605      +61     

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[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.