Step 0 — Requirements discovery

Workflow request

No application-specific workflow request was supplied. This baseline therefore documents an event-driven HTTP application reference architecture and marks all product choices as deferred during discovery.

Functional requirements

Accept authenticated HTTPS requests from external clients.
Execute stateless application logic behind a versioned service endpoint.
Publish asynchronous domain events from the application.
Process events independently and tolerate retry/redelivery.
Persist durable objects and application state separately.
Expose operational logs, metrics, and audit-relevant events.
Support repeatable infrastructure changes through declarative IaC.

Non-functional requirements

High availability within a selected Google Cloud region.
Horizontal scale for bursty HTTP traffic and asynchronous work.
At-least-once event delivery with idempotent consumers.
Encryption in transit and at rest using managed defaults initially.
Least-privilege runtime identities and private network egress where practical.
Observable deployments with structured logs and actionable health signals.
Reproducible, reviewable, non-deployment validation in CI.

Constraints

Google Cloud is the target cloud; exact products are not selected in discovery.
Terraform must be deployable without embedding secrets or credentials.
The baseline must not provision resources during validation.
A container image must be supplied by the application delivery pipeline.
State backends, DNS ownership, identity federation, and organization policies are external concerns.

Assumptions

A single region is acceptable for the initial deployment.
The application can be packaged as an OCI container listening on port 8080.
Events can use at-least-once semantics and consumers can deduplicate.
A dedicated Google Cloud project is available.
Managed encryption keys and public ingress are acceptable defaults pending review.

Open questions

What are the actual API, event, data-retention, and compliance requirements?
Which clients and identity provider must authenticate requests?
What are traffic, payload-size, latency, RTO, and RPO targets?
Which data is relational, document, object, or analytical?
Should ingress be public, private, or protected by an enterprise edge?
Are customer-managed keys, VPC Service Controls, or regional DR required?
What image registry, CI identity, environment promotion, and rollback policy apply?
What budget, quota, naming, tagging, and organization-policy constraints apply?

Product selection deferred: true for this phase.

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