Purpose: Environment-specific overrides (dev, test, staging, prod) merged on top of config/defaults/.
What belongs here: One YAML per environment containing only the keys that differ from the default.
What must not be stored here: Secrets or production credentials — only non-secret behavioral overrides (sampling rates, retry counts, log level). Reference secrets via the vault, per .env.example.
Owner: [TENANT_CONFIGURATION_REQUIRED — DevOps]
Contents: dev.yaml · test.yaml · staging.yaml · prod.yaml
Status: Populated.