Quick Note — Recommend an Application Configuration Management Solution
AZ-305 › Unit 4: Design infrastructure solutions › Design an application architecture › Recommend an application configuration management solution
Quick Note — Recommend an Application Configuration Management Solution
A payments team rolls out a "5% discount" promotion at on Black Friday. The discount is meant to expire at . Three engineers are needed to coordinate the change: one to update the appsettings.json in source control, one to redeploy four services in two regions, one to verify the change took effect everywhere. The deployment takes 22 minutes; by traffic has spiked and the team is too busy to safely redeploy if anything needs adjusting. At the same dance repeats, this time without the luxury of a low-load window. The fix is one architectural change: move all promotion configuration into Azure App Configuration with feature flags.…
Retrieval target
- Recommend an Application Configuration Management Solution
- Closed-book recall
- 5 minutes
- Open the full lesson after a miss
Decision anchors
| Prompt | Compact answer |
|---|---|
Azure App Configuration | A managed centralised configuration store for application settings — key/value pairs with optional labels (e.g., Prod, Dev), feature flags, and JSON / XML / text content types. SDKs for .NET, Java, Python, JS auto-refresh on change. Replaces scattered appsettings.json per environment. Two tiers: Free (limited keys, no replication) and Standard (10K keys / store, geo-replication, 99.9% SLA). |
| App Configuration Label | An optional secondary index on a key — same key can have different values per label (e.g., DB:ConnectionString with labels Prod, Dev, Test). Clients fetch values by (key, label). Replaces having three separate stores per env. Empty label = default. Recommended pattern: one store, label per environment, fetched at boot by the app's ASPNETCORE_ENVIRONMENT-equivalent var. |
Feature flag | A toggle stored in App Configuration that controls whether a code path is active at runtime. The Microsoft.FeatureManagement SDK reads the flag and gates code with if (await featureManager.IsEnabledAsync("NewCheckout")). Supports percentage rollout (gradual exposure), targeting (per-user, per-group), and time-window filters. Used to decouple deploy from release. |
Key Vault reference (App Configuration) | A special key in App Configuration whose value is a URI pointing at a Key Vault secret (@Microsoft.KeyVault(SecretUri=https://kv.vault.azure.net/secrets/db-pwd/)). The SDK resolves the reference using the app's managed identity at fetch time. The actual secret stays in Key Vault — App Configuration only carries the pointer.… |
Read the answers once, then cover the right-hand column and reconstruct each one from the prompt. A useful answer names the requirement, the recommended control or service boundary, and the nearest alternative it rejects. If you can only recognize the answer after seeing it, retrieval is not yet secure.
Ninety-second explanation
Without notes, explain:
- What requirement signals this learning objective rather than a neighbouring one?
- Which two solution families are most likely to be compared?
- Which hard constraint eliminates the strongest distractor?
- What identity, network, data, or failure boundary must appear in the design?
- Which operational test would prove the recommendation works?
Then compare your explanation with the full lesson. Record the missing decision rule—not merely the missed product name—in your error log.
When to open the full lesson
Open the curriculum-linked lesson when you cannot explain a comparison, when a scenario depends on a numeric limit or SKU feature, or when the service is on a retirement path. Use current Microsoft Learn documentation for availability, limits, pricing, naming, and migration milestones; the quick note is intentionally compact.
Source and freshness
Derived from the linked AZ-305 lesson and retrieval deck, grounded in both attached course sources. Reviewed 2026-08-02. Current Microsoft documentation controls changing product contracts.