2.0 KiB
2.0 KiB
Purpose
Define stable requirements for cache-observability-hardening.
Requirements
Requirement: Layered Cache SHALL Expose Operational State
The route cache implementation SHALL expose layered cache operational state, including mode, freshness, and degradation status.
Scenario: Redis unavailable degradation state
- WHEN Redis is unavailable
- THEN health endpoints MUST indicate degraded cache mode while keeping L1 memory cache active
Requirement: Cache Telemetry MUST be Queryable for Operations
The system MUST provide cache telemetry suitable for operations diagnostics.
Scenario: Telemetry inspection
- WHEN operators request deep health status
- THEN cache-related metrics/state SHALL be present and interpretable for troubleshooting
Requirement: Health Endpoints SHALL Expose Pool Saturation and Degradation Reason Codes
Operational health endpoints MUST report connection pool saturation indicators and explicit degradation reason codes.
Scenario: Pool saturation observed
- WHEN checked-out connections and overflow approach configured limits
- THEN deep health output MUST expose saturation metrics and degraded reason classification
Requirement: Degraded Responses MUST Be Correlatable Across API and Health Telemetry
Error responses for degraded states SHALL include stable codes that can be mapped to health telemetry and operational dashboards.
Scenario: Degraded API response correlation
- WHEN an API request fails due to circuit-open or pool-exhausted conditions
- THEN operators MUST be able to match the response code to current health telemetry state
Requirement: Operational Alert Thresholds SHALL Be Explicitly Defined
The system MUST define alert thresholds for sustained degraded state, repeated worker recovery, and abnormal retry pressure.
Scenario: Sustained degradation threshold exceeded
- WHEN degraded status persists beyond configured duration
- THEN the monitoring contract MUST classify the service as alert-worthy with actionable context