doc_id: UC-OPS-EVENT-NOTIFY-001 scn_id: SCN-OPS-EVENT-TASKFLOW-001 title: Plugin Release Event Notification Orchestration status: Draft version: v0.1.0 repo_key: powerx scope: powerx layer: service domain: ops scenario_title: "PowerX Event & Taskflow Management" owners:

• name: Matrix Ops role: Platform Ops Lead contact: ops@artisan-cloud.com
• name: Eva Zhang role: Automation Steward contact: automation@artisan-cloud.com contributors: [] linked_requirements:
• SCN-OPS-EVENT-TASKFLOW-001-A code_refs:
• repo: powerx path: internal/events/bus/publisher.go description: Standard event model wrapper and publication entrypoint
• repo: powerx path: internal/events/subscriptions/router.go description: Subscription matching, idempotency checks, and rate governance
• repo: powerx path: internal/events/delivery/webhook_dispatcher.go description: Webhook / queue delivery pipelines and retry policies
• repo: powerx path: internal/events/storage/event_log_repository.go description: Event persistence and trace query interface
• repo: powerx path: pkg/audit/event_audit_logger.go description: Audit log emission and alert triggers feature_flags:
• event-bus-v2
• plugin-release-webhook
• audit-streaming optional: false last_reviewed_at: 2025-10-31

---

Usecase Overview

• Business Goal: "Deliver plugin.release.published and other critical events to every subscriber within 5 seconds after a plugin release, with traceability, compensation, and idempotency guarantees so that cross-system collaboration fires on time."
• Success Metrics: Initial delivery success rate ≥ 97%; cumulative success rate after retries ≥ 99.5%; duplicate delivery rate < 0.5%; subscriber ACK latency P95 ≤ 3 seconds; audit coverage 100%.
• Scenario Alignment: "Supports Stage 1 of SCN-OPS-EVENT-TASKFLOW-001, providing the trusted event source for scheduling, Agent orchestration, and recovery flows."

Unified event models and delivery strategies enable a closed loop that notifies the Ops console, CI/CD, and alert platforms immediately after each plugin release.

Context & Assumptions

• Prerequisites
  • Feature flags event-bus-v2, plugin-release-webhook, and audit-streaming are enabled.
  • Kafka / event bus is available; subscriptions are stored in the event_subscription table and maintained through the console.
  • Subscriber Webhook/queue endpoints support HMAC signatures, idempotency tokens, and retry handling.
• Inputs / Outputs
  • Inputs: "plugin.release.published events emitted by the release pipeline, subscription definitions, idempotency keys, tenant context."
  • Outputs: Delivery requests per subscriber, delivery status, event log persistence, audit events, metrics.
• Boundaries
  • Does not cover release pipeline approval or signing workflows.
  • Subscriber internal processing is out of scope; this usecase guarantees delivery and failure alerting only.
  • Cross-region replication latency is handled by mirroring tasks; this usecase focuses on the primary region.

Solution Blueprint

Architecture Layers

Layer	Key Modules	Responsibility	Code Entry
Event Publication	internal/events/bus/publisher.go	Validate schema & tenant, generate idempotency key, publish to bus	services/events
Subscription Matching	internal/events/subscriptions/router.go	Resolve subscribers, apply rate limits and permissions	services/events
Delivery Execution	internal/events/delivery/webhook_dispatcher.go	Webhook/queue delivery, retry, circuit breaking, delay control	services/events/delivery
Storage & Trace	internal/events/storage/event_log_repository.go	Persist events, delivery status, retry history for query	services/events/storage
Audit & Observability	pkg/audit/event_audit_logger.go	Emit audit stream, trigger failure alerts, publish metrics	pkg/audit

Flow & Sequence

1. Step 1 – Publish Event: "The release service calls PublishEvent, validating schema, tenant, and idempotency key before writing to Kafka topics."
2. Step 2 – Match Subscriptions: The router consumes events, filters subscribers by tenant and tags, and applies rate limits/blacklists.
3. Step 3 – Execute Delivery: The dispatcher sends Webhook/queue messages, records response codes and latency, and schedules delayed retries on failures.
4. Step 4 – Trace & Alert: Delivery outcomes are written to the event store and audit stream; breaches trigger PagerDuty/IM alerts and sync to the Ops console.
5. Step 5 – Compensation & Replay: Operators replay events, adjust subscriptions, or create work orders through the console/CLI.

Contracts & Interfaces

• Inbound APIs / Events
  • EVENT plugin.release.published — Payload includes version, tenant, dependency list, actor, checksum.
  • POST /internal/events/publish — Manual replay endpoint requiring signatures and idempotency.
• Outbound Calls
  • Webhook: "POST https://<subscriber>/powerx/events with X-PowerX-Signature, 3 retries with exponential backoff."
  • Queue: "Deliver to tenant-defined Kafka topics/AMQP exchanges with tenant_id, event_id, attempt."
• Configs & Scripts
  • config/events/subscriptions.yaml — Default subscription templates.
  • scripts/ops/replay-event.mjs — Event replay utility.
  • scripts/ops/validate-webhook.mjs — Signature and connectivity test script.

Implementation Checklist

Item	Description	Status	Owner
Event schema	Define plugin.release.published schema and version compatibility	[ ]	Matrix Ops
Subscription governance	Implement tenant/tag matching, idempotency tokens, rate limiting	[ ]	Eva Zhang
Delivery channels	Build Webhook/queue dispatchers with retry & circuit breaking	[ ]	Matrix Ops
Console capabilities	Update subscription management, event trace UI, replay entry	[ ]	Eva Zhang
Observability & alerting	Integrate metrics, audit, PagerDuty/IM alerts, reporting scripts	[ ]	Matrix Ops

Testing Strategy

• Unit: Event publication validation, subscription filters (tags/tenants), HMAC signature generation/verification, retry scheduler.
• Integration: Validate successful delivery, delayed retry, idempotency enforcement using Kafka and Webhook simulators; run Usecase A-1/A-2.
• End-to-End: Trigger a real plugin release in staging; confirm Ops console, alerting platform, and CI/CD receive notifications; ensure event trace availability.
• Non-functional: Load test with 500 TPS; inject network drops/signature mismatches to verify retries and alert loop.

Observability & Ops

• Metrics: "event.delivery.success_total, event.delivery.retry_total, event.delivery.latency_p95, event.delivery.duplicate_total."
• Logging: "Record event_id, tenant_id, subscriber_id, attempt, status, latency_ms, signature_id; redact sensitive data."
• Alerts: Consecutive failures > 3 or failure rate > 5% over 5 minutes trigger PagerDuty; signature validation failures notify security channel.
• Dashboards: "Grafana Runtime Ops / Event Delivery, Datadog event.delivery.*, Ops console event center."

Rollback & Failure Handling

• Rollback Steps: Roll back publisher/dispatcher images, restore prior config, disable new feature flags, clean pending retries.
• Mitigations: "Use replay-event.mjs to resend failed events; adjust subscription settings; manually notify critical subscribers."
• Data Repair: "Run scripts/audit/reconcile-event-log.mjs to reconcile event store and audit stream; fix idempotency anomalies via SQL update."

Follow-ups & Risks

Risk / Item	Impact	Mitigation	Owner	ETA
Subscriber Webhook flooding causes delivery delay	Event latency, queue backlog	Add rate limiting, isolation queues, circuit breakers	Matrix Ops	2025-11-05
Missing automated reminders for signature key rotation	Security & delivery reliability	Introduce rotation schedule and alerts, enhance detection script	Eva Zhang	2025-11-12

References & Links

• Scenario: "docs/scenarios/runtime-ops/SCN-OPS-EVENT-TASKFLOW-001.md"
• Background: "docs/meta/scenarios/powerx/core-platform/runtime-ops/event-and-taskflow-management/primary.md"
• Scripts: "scripts/ops/replay-event.mjs, scripts/ops/validate-webhook.mjs"

---

Preconditions

• The scenario has entries in docs/_data/docmap.yaml, and corresponding repositories exist in docs/_data/repos.yaml.
• This notification path requires the event-bus-v2, plugin-release-webhook, and audit-streaming feature flags, as well as healthy Kafka, subscription configuration storage, Ops event center, and signing key vaults.
• Operational scripts (scripts/ops/replay-event.mjs, scripts/ops/validate-webhook.mjs) are up to date and ready for verification or compensation.

Generation Workflow

1. Register / Update docmap Children

   # docs/_data/docmap.yaml
   - scn_id: SCN-OPS-EVENT-TASKFLOW-001
     title: PowerX 事件与任务流管理
     children:
       - doc_id: UC-OPS-EVENT-NOTIFY-001
         scope: powerx
         layer: service
         domain: ops
         optional: false
         repo: powerx
         path: docs/usecases-seeds/SCN-OPS-EVENT-TASKFLOW-001/UC-OPS-EVENT-NOTIFY-001.md
       - doc_id: UC-OPS-TASK-SCHEDULE-001
         scope: powerx
         layer: ops
         domain: ops
         optional: false
         repo: powerx
         path: docs/usecases-seeds/SCN-OPS-EVENT-TASKFLOW-001/UC-OPS-TASK-SCHEDULE-001.md
       - doc_id: UC-OPS-AGENT-ORCHESTRATION-001
         scope: powerx
         layer: service
         domain: ops
         optional: false
         repo: powerx
         path: docs/usecases-seeds/SCN-OPS-EVENT-TASKFLOW-001/UC-OPS-AGENT-ORCHESTRATION-001.md
       - doc_id: UC-OPS-RETRY-RECOVERY-001
         scope: powerx
         layer: ops
         domain: ops
         optional: false
         repo: powerx
         path: docs/usecases-seeds/SCN-OPS-EVENT-TASKFLOW-001/UC-OPS-RETRY-RECOVERY-001.md

   • Ensure doc_id and path match the Seed files and downstream distribution paths.
   • optional: true/false flags are consumed by leadership views and publishing scripts (default to mandatory).

2. Copy Template into the Target Directory

   mkdir -p docs/usecases-seeds/SCN-OPS-EVENT-TASKFLOW-001
   cp docs/usecases-seeds/_template.md \
     docs/usecases-seeds/SCN-OPS-EVENT-TASKFLOW-001/UC-OPS-EVENT-NOTIFY-001.md

   • Keep doc_id consistent with docmap to avoid missing files during generation.
   • If multiple repos share the workflow, generate dedicated Seeds and reference shared modules in the body.

3. Fill in the Frontmatter

   • Align doc_id, scn_id, scope, layer, domain with docmap entries.
   • Use repo_key from docs/_data/repos.yaml (powerx here) and set scenario_title to the primary scenario name.
   • Default owners: Matrix Ops (Platform Ops Lead) and Eva Zhang (Automation Steward); update docmap if ownership changes.

• Include feature flags event-bus-v2, plugin-release-webhook, audit-streaming, and append any additional dependencies.

4. Complete the Body Sections

   • Usecase Overview: Highlight five-second delivery, ≥99.5% cumulative success, and idempotency targets.
   • Context & Assumptions: Detail schemas, subscription storage, Webhook HMAC, idempotency rules, and cross-region expectations.
   • Solution Blueprint through Rollback & Failure Handling: Elaborate on publication, matching, delivery, tracing/replay, and alert handling.
   • Contracts & Interfaces: Document EVENT plugin.release.published, EVENT event.delivery.failed, POST /internal/events/publish, and Webhook retry policies.
   • Testing Strategy: Cover positive delivery, delayed retry, signature failure, load/chaos testing.

5. Cross-link Scenario Documentation

   • Add a reference in docs/scenarios/runtime-ops/SCN-OPS-EVENT-NOTIFY-001.md so readers can jump between scenario and Seed.
   • Update related standards (docs/standards/events/event-bus-schema.md, etc.) if new contracts are introduced.

Self-checklist

• Frontmatter matches docmap.yaml; names and paths are case-consistent.
• Seed text covers publication, subscription governance, idempotency, retries, alerting, and compensation.
• scripts/ops/replay-event.mjs and scripts/ops/validate-webhook.mjs are validated against the latest code and telemetry.
• npm run lint and npm run docs:build succeed, ensuring syntax and build health.
• npm run publish:scenarios -- --scn-id SCN-OPS-EVENT-TASKFLOW-001 --validate-only passes structural checks.
• Downstream maintainers are informed; default branch (dev/docs) is writable; credentials/configs are staged in sandbox and production.

FAQ

Question	Resolution
What if subscriber Webhooks flood the system?	Document rate limiting, isolation queues, and circuit breakers within the Seed, plus metrics and runbooks.
How to handle large cross-region latency?	Note mirroring SLA in prerequisites, describe compensation strategies (manual replay or regional isolation), and extend scripts if needed.

After completing these steps, follow the Usecase Seed publishing guide to distribute updates downstream.