[dinakarjs]

Ready for independent review — 31 October 2026

Readiness assessed at 57e75a9aeacbdb68328b4a9297afbb9141aaf0d0: current metadata is mergeable; all returned PR-triggered technical workflows succeeded, and the public discussion contains no explicit unresolved draft hold or code-change request. Changed-file scope and current CONTRIBUTING requirements were checked. This is a readiness assessment, not a new full source audit, fresh suite run, independent approval or complete branch-protection inventory.

Synthetic delivery/lost-ack regression coverage only; no durable recovery, exactly-once delivery or Collector interoperability claim. The real Collector experiment remains separate in #100.

Independent maintainer review and normal merge gates remain required; no merge or release is authorized by this transition. Earlier test counts apply to their stated revisions; obsolete baseline CI failures below are superseded by the successful current-head runs. Prepared with OpenAI Codex.

---

Problem

Operational telemetry delivery and accepted evidence have different guarantees. Regression tests should preserve that boundary when projections disappear, duplicate, reorder, or fail, and when a persistence callback commits but loses its acknowledgement.

Changes

• Add a shared five-case delivery matrix consumed by Python and TypeScript, checked against existing pinned evidence-chain digests.
• Exercise false/throwing lost acknowledgements with an idempotent test store: no local acceptance or projection before acknowledgement; identical retry; no second projection on a later duplicate.
• Exercise Python OpenTelemetry ALWAYS_OFF/ALWAYS_ON sampling and a failing exporter without changing global providers.
• Document the test boundaries and remaining collector acceptance work. No runtime, schema, dependency or completeness-contract changes.

Validation

• Python: 161 tests passed with OTEL_TRACES_SAMPLER=always_on.
• TypeScript: build passed; 51 tests passed using node --import tsx --test test/*.test.ts; npm pack --dry-run passed.
• The normal npm test launcher was blocked by an environment EPERM on its IPC socket, so the same test files were run through Node's tsx loader.
• Mutation check: bypassing Python's acknowledgement guard causes the new lost-ack test to fail; production source restored.
• git diff --check passed.

Limits

Synthetic emitters and an in-memory store do not prove durable storage, crash recovery, OTLP wire behavior or collector interoperability. Python's real SDK exporter test is not a TypeScript exporter parity claim. The original local test environment did not supply Docker or a Collector; this PR's evidence remains synthetic. The documentation records the remaining version-pinned receiver/backend acceptance criteria.

Ready for independent maintainer review; this PR is not a draft.

[dinakarjs]

@imran-siddique Please independently review the two bounded delivery-test contributions, each on its own scope:

• test(evidence): exercise delivery faults and lost acknowledgements #99 at 57e75a9aeacbdb68328b4a9297afbb9141aaf0d0 is now ready for review: shared synthetic delivery/lost-ack controls and Python exporter sampling tests. Current-head CI passes. No durable-store, exactly-once or Collector interoperability claim.
• test: validate Python and TypeScript collector fault cases #100 at 3cf135ad1698d9157e99ff1396e8c1665bb0b4a3 exercises both SDKs through the real pinned Collector to a synthetic loopback backend. Current-head Collector experiment passes. In-memory saturation can lose events; restart does not prove persistent queue replay, and concurrent HTTP arrival order is not guaranteed.

All returned technical workflows for both heads succeed. Existing formal review requests remain; this single comment avoids separate duplicate reminders. Please identify remaining changes or disposition each bounded PR. Prior test results are not a fresh local rerun, independent approval or production-delivery certification. Prepared with OpenAI Codex.