feat(web): configure OpenTelemetry exports in diagnostics

[MatthewFeroz]

Problem

T3 Code already exports traces, metrics, and logs over OTLP, and the server already persists an endpoint for each signal. Diagnostics has no way to edit them, so users have to set environment variables and know that a restart applies changes.

Change

Settings > Diagnostics gets an OpenTelemetry export section below Top Span Names. It edits the traces, metrics, and logs endpoints for one environment, with Save and Discard. Save sends only the fields that differ from the saved settings, and typing a field back to its saved value drops it from the draft, so a save can't undo another client's edit to a signal you didn't change. Settings search finds it under "OTel", "OTLP", "telemetry export", and "Grafana".

Each endpoint has a Test button. The selected environment's server posts an empty export to the URL with that signal's running protocol and reports Connected with latency, Rejected with the HTTP status, Unreachable, or Timed out after 5 seconds. Saved endpoints are tested when the form opens, and again after Discard if a tested draft had replaced their status. A "Running:" line appears under a field when the server is using a different endpoint than the saved one, which happens before a restart or when an environment variable overrides it.

How the check handles credentials and requests:

• It attaches export headers only when the URL exactly matches that signal's running endpoint, and it doesn't follow redirects.
• It turns tracing off around its request. Effect's HTTP client records the full URL and any custom header in a span, and those spans are exported too. Without this, testing the logs endpoint could leak its credentials to the traces receiver. Effect's own OTLP exporter does the same.
• It releases the request as soon as the status arrives, so a receiver that never finishes its body can't hold the connection.
• The RPC accepts only http and https URLs. A data: URL would otherwise report Connected without contacting anything.

Testing needs settings:write, the same grant as saving the endpoints. It's registered in CLIENT_GUARDED_RPC_SCOPES, and the form uses the command's permissionAtom. A session without that grant sees a notice, and the form disables its controls and sends no checks. Servers advertise a new otlpEndpointCheck capability. Against an older server the form still edits endpoints but hides Test, so a newer client never calls a missing method.

The form mounts once per environment after Diagnostics access resolves and the first tables load, so the search target stays in view. Changing the Resource History window later doesn't remount it, so unsaved edits survive.

The user telemetry guide covers setup, restart, reachability from the server, authentication, and which variables win. OTEL_EXPORTER_OTLP_* endpoints take headers and protocol from the OTEL_* variables, not T3CODE_OTLP_*.

Verification

• vp test run for the endpoint check, contracts, client command permissions, RPC authorization, settings search, server settings, and export form suites. New tests cover tracing (a secret in the URL and in a custom header never reaches a span), request release, URL schemes, the settings:write requirement, and a field restored to its saved value staying out of a later save after another client changed it. The tracing, release, and restored-field tests fail with their fixes removed.
• tsc --noEmit reports 0 errors in contracts, client-runtime, server, and web. Targeted lint is clean apart from an existing warning in DiagnosticsSettings.tsx. The one remaining lint suppression covers an effect whose state updates happen only after an awaited response.
• Real web client in T3 Code's Browser panel, against an isolated dev server seeded from a pruned copy of real data and a local receiver on localhost:14318. I went through every state below. After a restart the receiver got real traces, metrics, and logs, and with T3CODE_OTLP_LOGS_URL set, logs went to the override. A session paired with only orchestration:read, orchestration:operate, and diagnostics:read sent no checks. For the older-server state I temporarily set the capability to false on the dev server and reverted it afterward.

Not exercised: the Electron shell, mobile, relay or tunnel connections, and a hosted collector. Mobile has no editor and uses whatever the server has configured. Agents can't test endpoints through MCP yet. The check is a service, so a tool can call it later.

Evidence

Before: Diagnostics ends at Top Span Names	After: endpoints tested against a local receiver

Video: search, automatic checks on open, Rejected, Checking, Timed out, Unreachable, and Discard re-checking the saved endpoints (25 seconds).

Every state of the form

Settings search, then the environment prompt under All environments:

Nothing configured:

A slow receiver while the check runs, then after the 5 second timeout:

A non-HTTP URL disables Test, and Save shows the format hint:

Saved, before a restart:

Reopened before the restart, with saved endpoints tested automatically:

After the restart, saved and running endpoints match:

T3CODE_OTLP_LOGS_URL overrides the saved logs endpoint:

Session without settings:write:

Server without the otlpEndpointCheck capability:

Dark mode, and a 390 px wide viewport:

Scope

This configures the existing OTLP exporters and endpoints. No maintainer has approved it in advance. It's proposed under the established-capability configuration route in CONTRIBUTING.md, and eligibility is the maintainers' call. Macroscope declined automatic approval because the change spans UI, RPC authorization, and outbound requests, so it needs a human review of direction and authorization.

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The original implementation used GPT-6, GPT-6 Astra, and GPT-6.1 Sol through the Codex harness in T3 Code. Copy, form, and documentation work used Claude Opus 5.5 through Claude Code in T3 Code. The October 10 merge, fixes, and browser verification used Claude Opus 5.5 through Claude Code in T3 Code, with three review passes by GPT-6 Astra through the Codex harness in T3 Code.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR adds a cross-layer OpenTelemetry configuration and endpoint-testing capability, including a new authorized RPC and server-side outbound HTTP requests. It also changes a capability default and adds a lint suppression, so the scope and policy implications require human review.

^{You can add or adjust custom eligibility rules. Learn more.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 0bc6a24 and 78edd26.

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📒 Files selected for processing (2)

• apps/web/src/components/settings/settingsSearch.test.ts
• apps/web/src/components/settings/settingsSearch.ts

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🚧 Files skipped from review as they are similar to previous changes (2)

• apps/web/src/components/settings/settingsSearch.test.ts
• apps/web/src/components/settings/settingsSearch.ts

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📝 Walkthrough

📝 Walkthrough

📝 Walkthrough

📝 Walkthrough

📝 Walkthrough

Walkthrough

The PR adds environment-scoped OpenTelemetry export settings for traces, metrics, and logs. It adds endpoint checks through a server RPC, diagnostics settings search and navigation updates, and documentation for endpoint setup and behavior.

Changes

Telemetry export configuration and checks

Layer / File(s)	Summary
Endpoint-check contract and RPC wiring packages/contracts/src/server.ts, packages/contracts/src/rpc.ts, packages/client-runtime/src/state/server.ts, apps/server/src/auth/RpcAuthorization.ts, apps/server/src/ws.ts	The RPC accepts a signal and URL and returns an accepted, rejected, or unreachable result. The client and server expose the RPC, which requires orchestration operate scope.
Endpoint check behavior and validation apps/server/src/observability/OtlpEndpointCheck.ts, apps/server/src/observability/OtlpEndpointCheck.test.ts	The service sends an empty export using the signal’s running protocol. It sends configured credentials only when the URL matches the running endpoint, does not follow redirects, and reports accepted, rejected, or unreachable results. Tests cover response statuses, failures, and credential handling.
Telemetry export settings form apps/web/src/components/settings/TelemetryExportSettings.tsx, apps/web/src/components/settings/DiagnosticsSettings.tsx	Diagnostics renders the environment-scoped form after initial loading completes. The form edits, tests, and saves signal endpoints, and reports when a server restart is required.
Settings discovery and endpoint guidance apps/web/src/components/settings/settingsSearch.ts, apps/web/src/components/settings/settingsSearch.test.ts, apps/web/src/components/settings/SettingsSidebarNav.tsx, docs/operations/observability.md, docs/user/telemetry.md	Search routes OpenTelemetry export and diagnostics to the environment-scoped diagnostics section. Tests cover search results and scope availability. Documentation describes endpoint configuration, checking, authentication, and environment-variable overrides.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant TelemetryExportSettings
  participant ServerRpc
  participant OtlpEndpointCheck
  participant Receiver
  TelemetryExportSettings->>ServerRpc: Send signal and URL
  ServerRpc->>OtlpEndpointCheck: Check endpoint
  OtlpEndpointCheck->>Receiver: Post empty signal export
  Receiver-->>OtlpEndpointCheck: Return HTTP response
  OtlpEndpointCheck-->>ServerRpc: Return check result
  ServerRpc-->>TelemetryExportSettings: Return accepted, rejected, or unreachable

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Merge Risk: ⚪ Minimal · up to 78edd

This change adds OTLP endpoint settings and endpoint checks. The supplied review context shows no outstanding merge-blocking issues.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 12 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly and concisely describes the main change: configuring OpenTelemetry exports in the web diagnostics settings.
Description check		The description includes the required Problem, Change, Scope, and Verification sections. It explains the behavior, authorization, compatibility, testing, manual verification, evidence, limitations, an…

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Actionable comments posted: 1

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Inline comments:
In `@apps/web/src/components/settings/settingsSearch.ts`:
- Line 454: Update the telemetry search result’s targetId from "diagnostics" to
"telemetry-export" so it points to the anchor rendered by
TelemetryExportSettings, and update the corresponding test expectation.

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📒 Files selected for processing (6)

• apps/web/src/components/settings/DiagnosticsSettings.tsx
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• apps/web/src/components/settings/settingsSearch.test.ts
• apps/web/src/components/settings/settingsSearch.ts
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[MatthewFeroz]

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[MatthewFeroz]

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[MatthewFeroz]

Addressed the retained concurrent-save concern in the CodeRabbit summary. The form now sends only endpoint fields whose trimmed values differ from the saved values. For example, a metrics-only save no longer includes a stale traces URL that could undo another client's disable action. The existing settings service merges the partial patch against its latest state; no new conflict mechanism or UI is needed.

The web typecheck, targeted form lint/formatting, and the focused observability-settings test pass. The earlier credential fix remains intact. The pre-existing endpoint-status draft remains local and is excluded from the final PR diff. Latest head: 0bc6a24f8.

[MatthewFeroz]

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Inline comments:
Review comments at @apps/web/src/components/settings/settingsSearch.ts:
- Line 509: Update the `diagnostics` search item’s `to` destination from the
General settings route to `/settings/diagnostics`, so selecting it opens the
Diagnostics page.

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• apps/server/src/auth/RpcAuthorization.ts
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• apps/server/src/observability/OtlpEndpointCheck.ts
• apps/server/src/ws.ts
• apps/web/src/components/settings/DiagnosticsSettings.tsx
• apps/web/src/components/settings/SettingsSidebarNav.tsx
• apps/web/src/components/settings/TelemetryExportSettings.tsx
• apps/web/src/components/settings/settingsSearch.test.ts
• apps/web/src/components/settings/settingsSearch.ts
• docs/operations/observability.md
• docs/user/telemetry.md
• packages/client-runtime/src/state/server.ts
• packages/contracts/src/rpc.ts
• packages/contracts/src/server.ts

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• docs/user/telemetry.md

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[MatthewFeroz]

On the points in Macroscope's approvability verdict, as of fc44bf6:

• Breadth across the web client, RPC authorization, and outbound requests. That's the feature, so it does need a human review. The endpoint check is a server service and the RPC handler only calls it. It's guarded by settings:write in CLIENT_GUARDED_RPC_SCOPES, the same grant as saving the endpoints. It sends export credentials only to the exact running endpoint, doesn't follow redirects, and doesn't trace its own request.
• Capability on by default. otlpEndpointCheck: true only tells clients that this server has the check RPC, so older servers hide the Test button. It doesn't turn on any export. Checks run when someone with settings:write opens the form with saved endpoints or presses Test.
• Lint suppressions. One remains. The dependency suppression is gone, because the effect now reads its state through useEffectEvent. The remaining react/set-state-in-effect suppression covers a call whose state updates happen only after the awaited response, and the reason is written next to it.

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[maria-rcks]

Note

Written by claude-opus-5-5 on behalf of Maria

Hi! We are cleaning up open PRs, and this one names a harness (Claude Code) but not which model version created it. If this change is really important, we recommend rebuilding the PR with a newer model and noting the model in the PR description.