Initial attempt at adding metric semconvs.

[tbrockman]

Fixes # TBD
Design discussion issue (if applicable) #
Slack context # https://cloud-native.slack.com/archives/C03GDP0H023/p1720453950905069

Changes

• Creates a new semantic_metrics.rs.j2 Jinja template for producing metric.rs, which contains Metric semantic conventions.
• Stores all attributes const &str in attributes.rs file
• Other files (resource.rs, trace.rs) re-export attributes from attribute.rs to preserve backwards compatibility (though it might be desirable to break compatibility here as it seems resource.rs and trace.rs both contain duplicated attributes from attribute_group)

Generated docstring VSCode examples:

As mentioned in Slack, it seems like the code generation will be migrated to weaver, but I'd already wrote this and perhaps this could be useful in the interim.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 75.0%. Comparing base (621a5a9) to head (1e128ce).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1918   +/-   ##
=====================================
  Coverage   75.0%   75.0%           
=====================================
  Files        122     122           
  Lines      20290   20290           
=====================================
  Hits       15221   15221           
  Misses      5069    5069           

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[cijothomas]

to preserve backwards compatibility

The crate is pre-release (with no planned stable release date as of today), so don't worry too much about back compatibility. Feel free to do the correct thing, without feeling burdened by the need of back-compatbility for this crate.

[tbrockman]

to preserve backwards compatibility

The crate is pre-release (with no planned stable release date as of today), so don't worry too much about back compatibility. Feel free to do the correct thing, without feeling burdened by the need of back-compatbility for this crate.

Oh awesome, I wasn't really aware of the current release status, thanks for the heads up!

Changes made to remove those attributes from trace.rs and resource.rs, making them available through attribute.rs.

[tbrockman]

Current CI failures are unrelated:

error: package `cc v1.1.0` cannot be built because it requires rustc 1.67 or newer, while the currently active rustc version is 1.65.0
Either upgrade to rustc 1.67 or newer, or use
cargo update -p cc@1.1.0 --precise ver
where `ver` is the latest version of `cc` supporting rustc 1.65.0
Error: Process completed with exit code 1.

Looks like #1924 might fix this, will update when that's merged.

[aumetra]

Looks like #1924 might fix this, will update when that's merged.

Yep, my PR adds an entry to the patch_dependencies.sh script to downgrade the crate to the last version that fits the semver requirements (namely cc v1.0.105)

[lalitb]

@tbrockman Can you also update changelog for the support of metrics semconvs, along with the breaking change for consolidation of attributes.

[tbrockman]

@tbrockman Can you also update changelog for the support of metrics semconvs, along with the breaking change for consolidation of attributes.

Can do.

[tbrockman]

@lalitb believe all related Cargo.toml's and CHANGELOG.md's should be up-to-date, let me know if I've missed anything.

[lalitb]

@lalitb believe all related Cargo.toml's and CHANGELOG.md's should be up-to-date, let me know if I've missed anything.

@tbrockman Just few nit comments, should be good to go otherwise. Thanks for the contribution.

[tbrockman]

@lalitb makes sense, I wasn't entirely sure what the release process entailed. Happy to contribute, thanks for making the process quick and painless 😬

[lalitb]

Thanks @tbrockman . One nit comment.