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