scn_id: SCN-OPS-TASK-SCHEDULE-001 title: Scheduler for Cron & Event-driven Tasks status: Draft version: v0.1.0 owners:

• name: Matrix Ops role: Platform Ops Lead contact: ops@artisan-cloud.com
• name: Eva Zhang role: Automation Steward contact: automation@artisan-cloud.com domains: [ops] layers: [ops, service] repos:
• key: powerx scope: core-platform responsibility: > Cron parsing, resource validation, task execution pipeline related_usecases:
• doc_id: UC-OPS-TASK-SCHEDULE-001 layer: ops domain: ops last_reviewed_at: 2025-10-31

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Executive Summary

The scheduling center triggers plugin workloads based on Cron expressions or event rules, ensuring tasks meet SLA commitments with full observability. This sub-scenario covers task registration, resource validation, execution invocation, status updates, and failure remediation so that batch, periodic, and event-driven jobs run reliably across tenants.

Scope & Guardrails

• In Scope: Cron/event task registration, Cron parsing, tenant quotas and mutual exclusion, execution triggers, status tracking, SLA alerting, retry hand-offs.
• Out of Scope: Plugin business logic, infrastructure scaling, and manual work-order approvals.
• Environment & Flags: "task-scheduler-v3, task-sla-monitor, task-retry-queue; depends on Redis/Etcd locks, Kafka execution queues, and Ops console dashboards."

Participants & Responsibilities

Scope	Repository	Layer	Responsibilities	Owners
core-platform	powerx	ops	Cron engine, task planner, execution client, status feedback	Matrix Ops (Platform Ops Lead / ops@artisan-cloud.com)
automation	powerx	ops	SLA alerting, runbooks, inspection reports, Ops console integration	Eva Zhang (Automation Steward / automation@artisan-cloud.com)

End-to-End Flow

1. Stage 1 – Task Registration: Admins configure Cron/event tasks while validating tenant scope and mutual exclusion rules.
2. Stage 2 – Pre-flight Scheduling: Ahead of trigger time, the scheduler performs resource checks, quota validation, and jitter control, queuing or warning when needed.
3. Stage 3 – Task Execution: At trigger time the runtime client invokes plugin runtimes/agents, records trace IDs, and captures heartbeats.
4. Stage 4 – Status Tracking: Execution results are persisted to the task store and metrics pipeline; failures dispatch retries or recovery.

Key Interactions & Contracts

• APIs / Events: "POST /internal/tasks/register, PUT /internal/tasks/{id}/pause|resume, EVENT task.execution.updated, EVENT task.execution.failed."
• Configs / Schemas: "config/tasks/default_policy.yaml, docs/standards/ops/task-sla-matrix.md, docs/standards/events/task-status-schema.md."
• Security / Compliance: Task operation permissions, audit logging, tenant-level quotas and isolation, SLA alert approvals.

Usecase Links

• UC-OPS-TASK-SCHEDULE-001 — Scheduler for Cron and event-driven task management.

Acceptance Criteria

1. On-time execution rate ≥ 98%, task success rate ≥ 97%, trigger latency < 1 minute.
2. Ops console shows real-time task status and logs, supports pause/resume and manual retries.
3. Resource conflicts are warned ≥ 90% in advance; SLA breaches alert within 60 seconds.

Telemetry & Ops

• Metrics: "task.scheduler.on_time_rate, task.scheduler.missed_total, task.execution.success_total, task.execution.retry_total, task.sla.breach_total."
• Alert thresholds: Scheduling failure rate > 5% over 5 minutes, three consecutive SLA breaches, lock contention > 70%.
• Observability sources: "Grafana Runtime Ops / Scheduler Overview, Datadog task.scheduler.*, Ops console timeline, scripts/ops/task-sla-report.mjs."

Open Issues & Follow-ups

Risk / Item	Impact	Owner	ETA
Scheduler auto-scaling not in place	SLA risks during peak load	Matrix Ops	2025-11-08
Mutual exclusion rules are complex and error-prone	Tasks blocked unintentionally	Eva Zhang	2025-11-15

Appendix

• docs/meta/scenarios/powerx/core-platform/runtime-ops/event-and-taskflow-management/primary.md
• scripts/ops/task-dryrun.mjs, scripts/ops/task-sla-report.mjs
• Ops console scheduling configuration guide (Confluence: Runtime-Ops-Scheduler)