docs(ADR): backfill context enrichment ADR in flagd

[leakonvalinka]

This PR

• backfills the ADR on static and dynamic context enrichment

Related Issues

Closes #1745

Notes

If I missed anything, please point it out so I can add it!

[gemini-code-assist]

Summary of Changes

Hello @leakonvalinka, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new Architectural Decision Record (ADR) to flagd, formally documenting the implementation and usage of static and dynamic context enrichment. The ADR clarifies how context data can be supplied to flagd for flag evaluations, either as persistent values configured at startup or as transient data extracted from incoming request headers. It also establishes a definitive merge priority for these context sources, ensuring predictable behavior when context keys overlap.

Highlights

• New ADR Document: Introduces a new Architectural Decision Record (ADR) to formally document the existing static and dynamic context enrichment features in flagd.
• Static Context Enrichment: Details the --context-value (-X) option, allowing static key-value pairs to be provided at startup for consistent context across all evaluations.
• Dynamic Context Enrichment: Explains the --context-from-header (-H) option, enabling automatic extraction of context values from specific request headers for dynamic, per-request evaluations.
• Context Merge Priority: Defines a clear priority list for merging context values when the same key is present in multiple sources (dynamic headers > static options > request body).

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[gemini-code-assist]

Code Review

This pull request adds a new Architecture Decision Record (ADR) for static and dynamic context enrichment in flagd. The ADR is well-written and accurately reflects the functionality. I've suggested a minor formatting improvement to ensure the document renders correctly and is easy to read.

[toddbaert]

Approved with some tweaks. This is historical so I will merge it next week unless somebody objects.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud