Prepare crates for otel v0.27.0

[lalitb]

Fixes #
Design discussion issue (if applicable) #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 27 lines in your changes missing coverage. Please review.

Project coverage is 55.4%. Comparing base (559fe64) to head (e6476da).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-stackdriver/src/lib.rs	0.0%	5 Missing ⚠️
...pentelemetry-user-events-logs/src/logs/exporter.rs	0.0%	5 Missing ⚠️
opentelemetry-datadog/src/exporter/intern.rs	0.0%	4 Missing ⚠️
...elemetry-contrib/src/trace/exporter/jaeger_json.rs	0.0%	3 Missing ⚠️
opentelemetry-datadog/src/exporter/mod.rs	80.0%	3 Missing ⚠️
opentelemetry-etw-logs/src/logs/exporter.rs	50.0%	2 Missing ⚠️
opentelemetry-aws/src/trace/xray_propagator.rs	0.0%	1 Missing ⚠️
opentelemetry-etw-logs/src/logs/converters.rs	0.0%	1 Missing ⚠️
opentelemetry-stackdriver/src/proto/api.rs	0.0%	1 Missing ⚠️
...ser-events-logs/src/logs/reentrant_logprocessor.rs	0.0%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #130     +/-   ##
=======================================
- Coverage   55.4%   55.4%   -0.1%     
=======================================
  Files         39      39             
  Lines       6105    6098      -7     
=======================================
- Hits        3385    3381      -4     
+ Misses      2720    2717      -3     

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[psandana]

I rather we add a branch that explicitly calls todo!. This way, upgrades to opentelemetry that adds a new value will fail to compile, forcing us to add support for it. Returning Null make it easy to forget.

Suggested change

	&_ => Value::Null,
	&_ => {
	// If we reach this line is because we are upgrading opentelemetry to a version that contains a new type.
	// We must add support for the new type.
	todo!("Add support for new types");
	}

[lalitb]

@psandana The goal is to ensure that adding a new enum variant in OpenTelemetry does not break custom exporters.

PS: I believe the suggested change won't cause a compile-time failure but will result in a runtime panic, which we want to avoid entirely.

[psandana]

@lalitb you are right. IMO, if compile error is preferred, then I would just remove the &_ entry. If opentelemetry ever adds a new item to the enum, it should come with code that handles it.

[psandana]

My bad. Forgot this is non-exhaustive, so you must use a default branch.

[psandana]

Same as in converters.rs file:

Suggested change

	&_ => {}
	&_ => {
	// If we reach this line is because we are upgrading opentelemetry to a version that contains a new type.
	// We must add support for the new type.
	todo!("Add support for new types");
	}

[lalitb]

@psandana same as the earlier comment.

[lalitb]

crates are published now:

~/obs/ot/opentelemetry-rust-contrib$ for crate in opentelemetry-*; do    
    data=$(curl -s "https://crates.io/api/v1/crates/$crate")
    latest_version=$(echo "$data" | jq -r '.versions[0].num')
    latest_date=$(echo "$data" | jq -r '.versions[0].created_at' | xargs -I{} date -d {} +"%Y-%m-%d %H:%M:%S")
    echo "$crate: version $latest_version, published at $latest_date"
done
opentelemetry-aws: version 0.15.0, published at 2024-11-25 22:44:15
opentelemetry-contrib: version 0.19.0, published at 2024-11-25 22:45:29
opentelemetry-datadog: version 0.15.0, published at 2024-11-25 22:46:17
opentelemetry-etw-logs: version 0.6.0, published at 2024-11-25 22:46:37
opentelemetry-etw-metrics: version 0.6.0, published at 2024-11-25 22:47:17
opentelemetry-resource-detectors: version 0.6.0, published at 2024-11-25 22:47:52
opentelemetry-stackdriver: version 0.24.0, published at 2024-11-25 22:48:33
opentelemetry-user-events-logs: version 0.8.0, published at 2024-11-25 22:49:18
opentelemetry-user-events-metrics: version 0.8.0, published at 2024-11-25 22:49:02
opentelemetry-zpages: version 0.12.0, published at 2024-11-25 22:50:04