fix: add optional to default_value

[yordis]

Signed-off-by: Yordis Prieto yordis.prieto@gmail.com

[cursor]

PR Summary

Medium Risk
Proto schema change may affect generated code and any consumers that assumed default_value was always present or used empty string as the required/optional signal.

Overview
Clarifies required-vs-optional semantics for environment-backed config fields by changing EnvVarOption.default_value from string to optional string, so generators can differentiate unset (required) from set to "" (optional with empty default).

Updates the inline schema/docs examples and invariants in options.proto to reflect the new behavior and show optional empty-string defaults and required repeated fields.

^{Written by Cursor Bugbot for commit e94258e. This will update automatically on new commits. Configure here.}

[coderabbitai]

Walkthrough

A protobuf message field in the EnvVarOption message is modified from a required string to an optional string, with accompanying documentation updates clarifying that an unset default_value indicates a required field, while any set value makes the field optional with that default.

Changes

Cohort / File(s)	Summary
Protobuf Schema Updates proto/trogon/env/v1alpha1/options.proto	Modified EnvVarOption.default_value field from string to optional string, enabling presence semantics. Documentation expanded to clarify required vs optional field behavior based on whether default_value is set.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A field once strict, now holds the choice,
Default or not—the schema's voice!
Optional now, with presence so clear,
Documentation blooms, no questions here! 🌱✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description only contains a sign-off line and lacks meaningful information about the changes, but it is not explicitly unrelated to the changeset.	Provide a more detailed description explaining why the optional keyword was added, what impact this has on the API contract, and any breaking changes or migration notes.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: adding the 'optional' keyword to the default_value field in the proto file, which matches the primary modification in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-add-optional

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf CI / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	⏩ skipped	Jan 31, 2026, 3:19 AM