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Azure App Configuration: Centralized Configuration, Labels for Environments, Sentinel-Key Refresh and Key Vault References

Azure App Configuration is for non-secret settings that several services share and that must change without a deploy; secrets stay in Key Vault and the store holds only references. On the official emulator we see, with real output, labels separating environments, a change that does not apply until the sentinel key changes, an unresolved Key Vault reference stopping startup and the 1-second refresh floor, and we manage changes through pull requests and a pipeline.