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feat(observability): export worker and workflow spans over OTLP (#61) - #326
This PR completes the end-to-end distributed tracing pipeline across SpaceApp by exporting worker activities and Temporal workflows over OTLP/HTTP JSON, correlating traces directly with incoming API request spans.
Implementation Details
Trace Context Propagation:
Propagates W3C traceparent from API turns / dispatch into Temporal workflow input and execution memos.
Extracts trace context within WorkflowTracingInterceptor and activity runtime.
OTLP Span Exporter in @space/contracts:
Shared, zero-dependency lightweight OTLP HTTP/JSON span exporter with batching, graceful shutdown, and endpoint configuration via SPACE_OTEL_EXPORTER_OTLP_ENDPOINT.
Worker Activity Spans:
Automatically wraps activity execution with start/end timestamps, error status codes, and attributes (temporal.activity.type, temporal.workflow.id, etc.).
Deterministic Workflow Spans:
WorkflowTracingInterceptor emits workflow lifecycle spans only during live execution (suppressed during history replays) ensuring determinism.
Tests & Documentation:
Comprehensive test suite in apps/worker/tests/otlp-worker-spans.test.ts.
Updated observability guides and configuration reference in docs/.
The PR moves the OTLP span exporter into @space/contracts and adds Temporal workflow and activity span export in worker processes. Workers propagate trace context through activities, child workflows, and continue-as-new requests. Tests and documentation cover export, replay suppression, and attribute sanitization.
The contracts package adds the OTLP exporter API, endpoint validation, bounded batch export, counters, and span-attribute sanitization. The runtime module re-exports the shared API.
Workflow spans and trace propagation apps/worker/src/workflow-tracing-interceptor.ts
The workflow interceptor creates workflow spans, extracts trace context and continuation links, and propagates traceparent headers to activities, child workflows, and continue-as-new requests.
Worker span recording and lifecycle apps/worker/src/worker-tracing.ts, apps/worker/src/worker.ts, apps/worker/src/activity-observability.ts, apps/worker/src/memory-*-worker.ts
Worker setup configures tracing sinks and workflow interceptors. Activity observation records spans using inbound trace context. Memory workers close the exporter during cleanup.
Tracing tests and configuration apps/worker/tests/*, apps/worker/tests/support/*, apps/worker/package.json, docs/configuration-reference.md, docs/quality/observability.md
Tests cover attribute sanitization, trace continuity, span relationships, and replay suppression. Test support and package scripts enable the integration tests. Documentation describes OTLP configuration and span coverage.
sequenceDiagram
participant APIRequest
participant TemporalWorkflow
participant WorkflowTracingInterceptor
participant ActivityObservabilityInterceptor
participant SpanExporter
participant OtlpCollector
APIRequest->>TemporalWorkflow: Start workflow with traceparent
TemporalWorkflow->>WorkflowTracingInterceptor: Execute workflow
WorkflowTracingInterceptor->>SpanExporter: Record workflow span
WorkflowTracingInterceptor->>ActivityObservabilityInterceptor: Schedule activity with traceparent
ActivityObservabilityInterceptor->>SpanExporter: Record activity span
SpanExporter->>OtlpCollector: POST OTLP batches
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Merge Risk: Low · previous review 04a03
Tracing is opt-in and does not interfere with core workflows. Before merge, fix the documented endpoint example (or the URL builder), and stop writing the W3C trace ID into the traceId log field. Local activities also do not yet carry trace context.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 26.32% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surv…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
Check name
Status
Explanation
Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title "feat(observability): export worker and workflow spans over OTLP (#61)" matches the main change in the changeset. The worker and workflow spans are exported over OTLP, and the diff adds the …
Linked Issues check
PR #61 is directly linked and remains open. The changes add a shared @space/contracts OTLP exporter with bounded buffering, drop and failure counters, request timeouts, endpoint configuration, and n…
Out of Scope Changes check
The changed files support issue #61. The shared exporter move, worker lifecycle cleanup, tracing interceptors, test helpers, integration tests, and documentation implement or verify the requested trac…
Full details: Title check
Explanation
The title "feat(observability): export worker and workflow spans over OTLP (#61)" matches the main change in the changeset. The worker and workflow spans are exported over OTLP, and the diff adds the shared exporter in @space/contracts, the workflow tracing interceptor, and the worker wiring. The title uses a conventional-commit prefix and a specific scope. It is concise and names the primary change. The title's issue number (#61) differs from the PR number in the objectives (#326), but this does not affect whether the title describes the change.
Full details: Linked Issues check
Explanation
PR #61 is directly linked and remains open. The changes add a shared @space/contracts OTLP exporter with bounded buffering, drop and failure counters, request timeouts, endpoint configuration, and no-op behavior when disabled. All three worker processes initialize and close the exporter. The workflow interceptor and activity interceptor propagate traceparent, create workflow and activity spans, support child-workflow and continuation links, suppress replay spans, and sanitize attributes through an allowlist. The added worker tests cover propagation, parent-child relationships, replay suppression, and attribute filtering. The changes also add the Temporal test dependency and update both required documentation files. The implementation adds no OpenTelemetry dependency.
Full details: Out of Scope Changes check
Explanation
The changed files support issue #61. The shared exporter move, worker lifecycle cleanup, tracing interceptors, test helpers, integration tests, and documentation implement or verify the requested tracing pipeline. The worker pretest build step and @temporalio/testing development dependency support the added tests. No changes add CLI or Browser Host spans, metrics, log export, sampling configuration, or trace-ID database columns.
Full details: Docstring Coverage
Explanation
Docstring coverage is 26.32% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 19 functions across 13 files. (3 skipped: 3 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 3
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @apps/worker/src/activity-observability.ts:
- Around line 186-188: Remove the fallback that assigns headerParent.traceId to
correlation.traceId; keep correlation.traceId reserved for the Space request ID
and use correlation.w3cTraceId for the W3C trace ID.
Review comments at @apps/worker/src/workflow-tracing-interceptor.ts:
- Around line 237-246: Add a scheduleLocalActivity method alongside
scheduleActivity that propagates workflowTraceparent through
SPACE_TRACEPARENT_HEADER using the same encoding and failure-safe behavior, then
calls next(input). Import LocalActivityInput from @temporalio/workflow for the
method signature.
Review comments at @docs/configuration-reference.md:
- Line 58: Update the SPACE_OTEL_EXPORTER_OTLP_ENDPOINT description to document
only a base URL and remove the `/v1/traces` full-endpoint example.
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…com#61)
- Move shared OTLP HTTP span exporter implementation to @space/contracts to share across runtime, api, and worker packages.
- Support OTLP endpoint configuration via SPACE_OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_TRACES_ENDPOINT, and OTEL_EXPORTER_OTLP_ENDPOINT with automatic /v1/traces appending.
- Implement OpenTelemetry workflow outbound interceptor in apps/worker/src/workflow-tracing-interceptor.ts for activity, child workflow, timer, and signal tracing.
- Support W3C traceparent context propagation across Temporal workflow continuations and activity invocations.
- Wire OTLP tracing into worker startup across memory mutation, maintenance, and task execution workers.
- Add comprehensive unit tests in apps/worker/tests/otlp-worker-spans.test.ts and apps/api/tests/otlp-span-exporter.test.ts.
- Update configuration reference and observability quality documentation.
Signed-off-by: TassioSales <tassiolucian.ljs@gmail.com>
Thank you for the time and care you put into this pull request.
We have decided to end the SpaceApp bounty programme, so pull requests made for the bounty issues will not be reviewed, merged or paid, and we are closing this one.
We are sorry for the work this affects, and thank you again for your interest in SpaceApp.
This issue and PR were advertised with an active cash bounty ( USD). After the contributor submitted production-ready code with complete test coverage, the organization unilaterally closed all community bounty PRs simultaneously without review or payment. We are formally reporting this organization to GitHub Support for deceptive bounty-baiting practices and labor harvesting in violation of GitHub Terms of Service.
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Context & Acceptance Criteria
Closes #61
This PR completes the end-to-end distributed tracing pipeline across SpaceApp by exporting worker activities and Temporal workflows over OTLP/HTTP JSON, correlating traces directly with incoming API request spans.
Implementation Details
traceparentfrom API turns / dispatch into Temporal workflow input and execution memos.WorkflowTracingInterceptorand activity runtime.@space/contracts:SPACE_OTEL_EXPORTER_OTLP_ENDPOINT.temporal.activity.type,temporal.workflow.id, etc.).WorkflowTracingInterceptoremits workflow lifecycle spans only during live execution (suppressed during history replays) ensuring determinism.apps/worker/tests/otlp-worker-spans.test.ts.docs/.Signed-off-by: TassioSales tassiolucian.ljs@gmail.com
Summary by CodeRabbit