docs(rfc): draft RFC 0046 — out-of-band tenancy - #699
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…derivation) Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
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📝 WalkthroughWalkthroughRFC 0046 documents out-of-band tenant selection for OTLP exports, tenant-aware WAL replay, authentication rules, Collector interoperability, and removal of RFC 0045 tenant derivation. The RFC index links to the new document. ChangesOut-of-band tenancy specification
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to This RFC establishes the tenant selector and new WAL frame contract, but it still leaves concrete behavior unspecified for duplicate and normalized selectors, malformed frame validation, durability timing, and downgrade/replay handling. Those gaps could cause inconsistent authorization, tenant routing, or recovery behavior in the implementation, so owner follow-up is needed before the PR is merge-ready. Possibly related PRs
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Pull request overview
Drafts and adds RFC 0046 to the documentation set, specifying an “out-of-band tenancy” model where the tenant is selected via request metadata (HTTP header / gRPC metadata) rather than derived from OTLP payload attributes, and records the corresponding WAL framing change at the spec level.
Changes:
- Add new RFC doc: RFC 0046 — Out-of-band tenancy (design + acceptance criteria + testing strategy).
- Link RFC 0046 into the mdBook RFC index (
docs/SUMMARY.md).
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| docs/SUMMARY.md | Adds RFC 0046 to the RFC listing so it appears in the mdBook navigation. |
| docs/rfcs/0046-out-of-band-tenancy.md | New RFC specifying tenant selection via out-of-band headers/metadata and the WAL frame kind extension, with acceptance criteria and testing strategy. |
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Actionable comments posted: 7
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Inline comments:
In `@docs/rfcs/0046-out-of-band-tenancy.md`:
- Around line 223-226: Update the RFC0046.6 acceptance criterion to clarify that
RFC0008 invariants and expected outcomes remain unchanged, while the
parameterized test harness adds coverage for frame kind 0x03.
- Line 112: Update the fenced WAL payload syntax block in the RFC to include a
text or plaintext language tag, resolving the Markdownlint MD040 warning while
preserving the block’s contents.
- Around line 85-88: Update the TenantId definition to specify canonical
transport encoding or rejection rules for non-ASCII and other unsupported values
across HTTP, gRPC, query, and MCP inputs. Normalize and trim the value, enforce
the 256-byte limit on its UTF-8 representation before authorization and
serialization, then reuse that canonical value consistently for authorization,
WAL, storage, and queries.
- Around line 113-123: Specify and implement validation of the TenantOtlpBatch
tenant prefix before protobuf decoding, rejecting zero-length, over-256-byte,
truncated, payload-overrun, and invalid-UTF-8 tenants as CRC-valid SinkRejected
invalid-payload errors; reserve unsupported replay handling for legacy 0x01
frames, and add acceptance tests covering each malformed case.
- Around line 211-216: Clarify RFC0046.4’s crash timing by stating that each
0x03 WAL frame is durably fsynced before acknowledgment, while the simulated
SIGKILL occurs before miner or downstream store flush. Preserve the tenant,
replay, and no-loss guarantees.
- Around line 125-131: Update RFC0046 to define the 0x03 downgrade contract:
older binaries must reject it as unsupported for replay rather than classify it
as corruption, and document the required recovery procedure for handling the WAL
before downgrading. Reconcile this with the existing 0x01 legacy-frame behavior
and preserve RFC0008.5’s corruption classification.
- Around line 69-83: Update OTLP export tenant extraction to collect all
X-Ourios-Tenant headers and x-ourios-tenant metadata values after
authentication, rejecting any request with more than one entry—including
duplicates—with 400 Bad Request for HTTP or INVALID_ARGUMENT for gRPC before
tenant authorization and WAL append.
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Pull request overview
Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.
Suppressed comments (2)
docs/rfcs/0046-out-of-band-tenancy.md:326
- The RFC references
scratch/openfga-spike.mdandscratch/openfga-ai-review-2026-08-17.md, but/scratchis gitignored and not present in the repo. This leaves broken references in a tracked RFC; consider removing the file paths or replacing them with repo-tracked references (e.g., the #688 discussion and the follow-on RFC note).
- #688 — the tenancy concept discussion; the OTel-docs finding that
multi-tenancy is out-of-band (comment 1, point 2), and the OpenFGA
resolver spike (`scratch/openfga-spike.md`).
- OpenFGA assistant review of the two-layer model
(`scratch/openfga-ai-review-2026-08-17.md`) — tenant as coarse object,
never per-conversation; the 2-step planner pattern RFC 0047 adopts.
docs/rfcs/0046-out-of-band-tenancy.md:304
- Minor grammar/line-break issue in the testing strategy paragraph: the sentence currently breaks as "RFC0046.9 is a" on one line and continues on the next, which reads awkwardly in rendered docs.
validation gets its own rejection cases. RFC0046.8 in the CI-only collector interop job. RFC0046.9 is a
`git grep` in the PR description plus the compile.
…ion, downgrade contract Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
f2e56e8 to
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Pull request overview
Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.
Suppressed comments (2)
docs/rfcs/0046-out-of-band-tenancy.md:214
- The PR description says this RFC has “Ten §5 criteria”, but the RFC text currently defines 11 acceptance criteria (RFC0046.1 through RFC0046.11). Please make these consistent (either update the PR description/count, or remove/merge a criterion if the intent is exactly 10) so the review checklist and downstream test mapping don’t drift.
## 5. Acceptance criteria
Scenario ids `RFC0046.<n>`.
docs/rfcs/0046-out-of-band-tenancy.md:6
- The PR is labeled/described as a draft RFC, but this RFC’s frontmatter (and the status callout in the body) sets
status: specified. That’s a meaningful lifecycle stage perdocs/rfcs/README.md(specified implies §5 criteria are complete/testable), so this mismatch is likely to confuse reviewers and any tooling that filters by status. Align either the PR labeling or the RFCstatus/status block so they communicate the same stage.
This issue also appears on line 211 of the same file.
title: Out-of-band tenancy — the credential names the tenant, the data never does
status: specified
author: Jens Holdgaard Pedersen <jens@holdgaard.org>
drafting-assistance: Claude
Drafts RFC 0046 — out-of-band tenancy, applying the maintainer's ruling (2026-08-17) that tenancy does not reside in OTLP data: the credential names the tenant, the payload never does.
What it specifies
X-Ourios-Tenant(HTTP) /x-ourios-tenant(gRPC), required in open mode too (no default tenant — RFC0003.4's posture kept), must be in the credential's set when auth is on — the querier's RFC 0016/0026 rule applied verbatim to ingest. One rule for both roles; a Collector sets it once.ResourceLogsfan-out retired; missingservice.nameis a NULL promoted column, not a rejection. Resource attributes describe the producer and are filters/promoted columns inside a tenant — never a partition key.0x03 TenantOtlpBatch(u16 len ‖ tenant ‖ protobuf); replay derives nothing; the RFC 0045 rule-epoch log is deleted. Legacy0x01frames abort startup with a named remedy (per the persisted-layout ruling), never classified as corruption.Storedouble-encoding fix andTenantIdopacity kept. RFC 0045 staysgreenand is superseded when this lands.service.name, RFC 0008 suites over the new kind, selector hygiene round-trip, Collector interop with the header, and an explicit "derivation is gone" criterion naming the retired tests (CLAUDE.md §6.2 contract change made explicit).Why this and not RFC 0045
Every derived tenant is a function of producer descriptors — two sources of truth once an authority model (tokens today, the RFC 0047 relationship graph next) says who owns what, and the producer picks its own tenant. OTel's own multi-tenancy is out-of-band (
X-Scope-OrgID,headers_setter, batch-by-tenant metadata + auth extension) — the #688 OTel-docs finding the strawman drifted from.§9 records the follow-on RFC 0047 (OpenFGA resolver + graph-fed visibility over GenAI columns) that this RFC is the prerequisite for; the OpenFGA assistant review it cites is in
scratch/.Invariants touched: §3.4 (frame format — payload-agnostic invariants hold, RFC0046.6), §3.7 (multi-tenancy — the reason for the RFC). Doc-only PR; implementation follows in slices.
Tracks #688.
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