Prove Cloudflare WordPress fleet performance, resilience, and cost

[chubes4]

Parent: #1970

Goal

Establish production readiness for an elastic preview fleet through dimension-based performance, concurrency, failure, multi-region, and cost evidence.

Workloads

• 100-site and 1,000-site allocation/provisioning campaigns
• concurrent artifacts of varied page count, decoded size, asset volume, and runtime complexity
• anonymous publication reads from multiple regions and cache states
• warm/cold admin, REST, edit, media, and subsequent-import traffic
• D1/R2/queue latency, throttling, duplicate delivery, Worker eviction, timeout, and partial-failure injection
• long-running soak with expiration, deletion, reclamation, and allocation reuse

Required evidence

• p50/p95/p99 latency by API stage and public/dynamic read path
• allocation and ready-site throughput under bounded concurrency
• PHP-WASM boot/execute/persist memory and CPU high-water marks
• queue age, retries, dead letters, publication lag, and recovery time
• D1 rows/queries, R2 requests/bytes/storage, Worker CPU, and estimated cost per site lifecycle
• isolation and invariant violations, not only aggregate success counts

Acceptance criteria

• Publish explicit SLOs and pass/fail budgets before running the acceptance campaign.
• No cross-site state, cache, credential, operation, or publication leakage occurs.
• Failure injection proves committed state and previous publications remain recoverable.
• Throughput does not degrade linearly with configured site count.
• Public cached-read latency remains independent of PHP-WASM and coordinator load.
• Known gaps are reported by semantic dimension: lifecycle, state transitions, resources, compatibility, and regional behavior.
• Evidence is reviewer-resolvable and linked to this tracker.
• No production deployment or load test is performed without explicit authorization.

AI assistance

OpenAI GPT-5.6 Sol via OpenCode translated the current two-site evidence and measured latency gaps into this fleet acceptance contract with Chris Huber.