LCORE-4313: (design) PII redaction strategy

[anik120]

Description

Addendum for docs/design/observability-opentelemetry/observability-opentelemetry-design.md

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up service version
• Bump-up dependent library [pyproject.toml + uv.lock]
• Bump-up dependent library [requirements.*.txt for Konflux]
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change
• Unit tests improvement
• Integration tests improvement
• End to end tests improvement
• Benchmarks improvement

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Related Tickets & Documents

• Related Issue #
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Checklist before requesting a review

• I have performed a self-review of my code.
• PR has passed all pre-merge test jobs.
• If it is a core feature, I have added thorough tests.

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Summary by CodeRabbit

• Documentation
  • Documented expanded observability capture for core inference requests, including raw inputs, outputs, retrieval data, feedback comments, and related request identifiers.
  • Clarified that identity fields remain anonymized while safety identifiers and content fields may be recorded verbatim.
  • Defined encoding conventions for structured telemetry attributes and collections.
  • Added requirements for centralized emission-time redaction with pluggable redaction providers.

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Walkthrough

The design document adds an observability addendum for three inference spans. It defines raw content capture, structured attribute encoding, pluggable redaction, fail-closed emission, and separate handling for identity and content fields.

Changes

Observability design

Layer / File(s)	Summary
Raw content and redaction requirements docs/design/observability-opentelemetry/observability-opentelemetry-design.md	The addendum permits raw content for selected inference span fields while retaining anonymization for user.id. It records safety_identifier verbatim, defines encoding rules for structured attributes, proposes pluggable redaction at emission, and adds requirements R11-R14.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: 🟠 High · up to fd81b

Raw telemetry may expose PII, and large or unserializable evaluation payloads may be lost. Define safe activation and loss handling before merging.

🚥 Pre-merge checks | ✅ 7

✅ Passed checks (7 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Performance And Algorithmic Complexity	✅ Passed	PASS. The review-scoped diff changes only one Markdown design document and adds no executable code, handlers, API list operations, caches, watchers, or buffers. The document discusses synchronous reda…
Security And Secret Handling	✅ Passed	PASSED. The pull request changes only docs/design/observability-opentelemetry/observability-opentelemetry-design.md; it adds no runtime code, API endpoint, WebSocket path, log statement, secret, tok…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the pull request as a design change for the PII redaction strategy. This matches the main focus of the observability OpenTelemetry addendum.

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[anik120]

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Actionable comments posted: 5

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In
`@docs/design/observability-opentelemetry/observability-opentelemetry-design.md`:
- Line 416: Add one blank line immediately before the “A2. LCORE-3755 gap
analysis and remaining work” heading to satisfy markdownlint MD022.
- Around line 475-481: Update the span-event encoding design around “Span
events, one per item” to define how collections exceeding
OTEL_SPAN_EVENT_COUNT_LIMIT are handled. Either enforce a supported maximum with
explicit truncation metadata, or specify a loss-free batching strategy, while
preserving R11’s complete-detail requirement.
- Around line 492-494: Update the observability design requirements near R11 to
define canonical JSON serialization for structured event fields, including
deterministic settings and rejection of non-finite values such as NaN and
Infinity. Specify that non-serializable values cause the affected structured
field or event to be omitted rather than emitting unserialized data, while
preserving R9’s requirement that telemetry failures never interrupt the request;
keep redaction concerns under R13.
- Around line 409-412: Update the observability classification and R14 rules to
pseudonymize the stable correlation field session.id (derived from
conversation_id) while routing content field a2a.request.id through centralized
PII redaction. Ensure the A2A producer no longer assigns a2a.request.id directly
via set_span_attributes without redaction, and preserve verbatim handling for
safety_identifier.
- Around line 523-531: Update the observability design to gate R11 raw capture
on successful redactor activation: resolve the GitHub default or downstream
adapter before enabling capture, route every request.input and response.output
write—including streaming, RAG, and tool-use fields—through the centralized
fail-closed redaction helper, and omit fields when the slot is unset,
initialization fails, or redaction raises. Mark criteria 2 and 3 as blocked
until these conditions are met, with no raw fallback through
set_span_attributes, set_attribute, or add_event.

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• docs/design/observability-opentelemetry/observability-opentelemetry-design.md

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🧰 Additional context used

📓 Path-based instructions (1)

Flag meaningful O(n^2)+ algorithms on non-trivial inputs, including handlers and Kubernetes list operations.

📄 CodeRabbit inference engine (Custom checks)

Files:

• docs/design/observability-opentelemetry/observability-opentelemetry-design.md

🪛 markdownlint-cli2 (0.23.2)

docs/design/observability-opentelemetry/observability-opentelemetry-design.md

[warning] 416-416: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Above

(MD022, blanks-around-headings)

🔇 Additional comments (2)

docs/design/observability-opentelemetry/observability-opentelemetry-design.md (2)

513-516: 🔒 Security & Privacy | 🛡️ Detected with Advanced Tier

Cover secrets and confidential data, not only PII. R11 adds raw tool arguments, tool results, and RAG content. The listed recognizers do not cover API keys, bearer tokens, passwords, or confidential prompt and tool content. If these values can enter the fields, R12 permits their export to hosted OTLP and cross-organization sharing. Add secret detection or use an explicit allowlist before enabling raw capture.

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523-531: 🔒 Security & Privacy | 🛡️ Detected with Advanced Tier

The design already requires fail-closed redaction before export.

Section A4 assigns a redactor to both builds, routes content through one helper, prevents raw values from reaching spans, and omits fields when redaction fails. This addresses the proposed raw-capture safety control.

Likely an incorrect or invalid review comment.

[anik120]

@rdmullett fyi

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