Entur conventions

Entur Conventions (Router)

This skill is a thin router. It does not bundle convention content — it fetches the matching guide from the entur/ai repository when activated.

Critical rules (always apply, no fetch needed)

These rules are non-negotiable and apply to every Entur application:

1. ALWAYS use Google Secret Manager + ExternalSecrets in Helm. Never hardcode secrets.
2. ALWAYS use IAM roles from the approved list. Never grant roles outside it. Request additions in #talk-utviklerplattform.
3. ALWAYS use Entur Terraform modules: terraform-google-init, terraform-google-sql-db, terraform-google-memorystore, terraform-google-cloud-storage.
4. ALWAYS use Entur reusable GitHub Actions workflows. Never write custom CI steps.
5. ALWAYS use the Entur common Helm chart for K8s deployments.
6. ALWAYS pin dependencies — Terraform ?ref=TAG, Actions @vN, Docker images by specific tag.
7. Every service includes health checks, structured logging, Prometheus metrics.
8. Default region: europe-west1.
9. Conventional commits — enables automated semver via release-please.
10. Every PR passes lint, unit tests, security scan (CodeQL + Docker scan), Helm lint.
11. ALWAYS create GCP projects via self-service YAML manifests in .entur/ (GoogleCloudApplication, GoogleCloudFirebaseApplication, GoogleCloudDataProject). Never use Terraform google_project or gcloud projects create.

How to use this skill

guides/ is split into three layers — pick the right one and fetch:

• guides/platform/ -- platform-provided capabilities (self-service, common chart, reusable workflows, Terraform modules, Permission Store, Kafka starter).
• guides/playbooks/ -- end-to-end tasks (bootstrap, add postgres/redis/kafka, set up auth, deploy to prd). Prefer these as the entry point for multi-step work.
• guides/reference/ -- language and topic standards (Java, Kotlin, Go, Docker, observability, security, etc).

URL pattern:

https://raw.githubusercontent.com/entur/ai/main/guides/<layer>/<file>.md

Cross-language baseline always applies — fetch first when starting a non-trivial task:

https://raw.githubusercontent.com/entur/ai/main/CONVENTIONS.md

Playbook index (prefer these for multi-step tasks)

Goal	Path
Bootstrap a new service	guides/playbooks/bootstrap-service.md
Add managed Postgres	guides/playbooks/add-postgres.md
Add Memorystore Redis	guides/playbooks/add-redis.md
Produce/consume Kafka events	guides/playbooks/add-kafka.md
Set up authentication/authorization	guides/playbooks/set-up-auth.md
Promote a service to prd	guides/playbooks/deploy-to-prd.md
Deprecate or delete a service	guides/playbooks/deprecate-service.md
Run the service locally	guides/playbooks/local-dev.md

Platform capability index

Topic	Path	When to fetch
Self-service	guides/platform/self-service.md	.entur/*.yaml, GCP project naming, metadata.id vs metadata.name
Common Helm chart	guides/platform/common-helm.md	helm/<app>/, common chart, ExternalSecrets values
Reusable GHA workflows	guides/platform/gha-workflows.md	.github/workflows/*.yml, Entur reusable workflows
Composite GHA actions	guides/platform/gha-actions.md	custom steps using entur/gha-meta actions
Terraform modules	guides/platform/terraform-modules.md	*.tf, Entur Terraform modules (init, SQL, Redis, GCS)
Approved IAM roles	guides/platform/iam-roles.md	granting any IAM role — only roles on this list are approved
Permission Store	guides/platform/permission-store.md	Permission Client, @PreAuthorize, business capabilities
Entur Kafka starter	guides/platform/entur-kafka-starter.md	producers, consumers, Avro/Protobuf, Aiven clusters

Reference index (language and topic standards)

Topic	Path	When to fetch
Kotlin services	guides/reference/kotlin.md	editing .kt, build.gradle.kts, designing a Kotlin Spring Boot service
Java services	guides/reference/java.md	editing .java, JVM patterns shared with Kotlin
Go services	guides/reference/go.md	editing .go, go.mod
API design	guides/reference/api-design.md	designing REST or gRPC contracts
Architecture	guides/reference/architecture.md	service boundaries, DB conventions, resilience, lifecycle
Docker	guides/reference/docker.md	Dockerfile, multi-stage builds, distroless
Logging	guides/reference/logging.md	structured JSON logs, traceId, requestId
Observability	guides/reference/observability.md	health endpoints, Prometheus metrics, tracing
Security	guides/reference/security.md	secrets, scanning, allowlists in .entur/security/, headers
Code review	guides/reference/code-review.md	reviewing or preparing a PR
Markdown	guides/reference/markdown.md	.md files, markdownlint
Documentation	guides/reference/documentation.md	writing user-facing prose

If the topic is not listed but you suspect a guide exists, try fetching from guides/platform/<topic>.md, guides/playbooks/<topic>.md, or guides/reference/<topic>.md in that order. Contributors add new conventions by adding markdown files under guides/; this skill picks them up automatically.

Fallback

When the user mentions a tool or concept that is not covered by an Entur guide, fall back to general best practices. Do not guess Entur-specific patterns.