Description

This review-only policy identifies successfully provisioned Azure Cache for Redis instances that have recorded zero cache hits and zero cache misses over 30 days.

Rationale

A cache with no lookup activity may be idle while continuing to incur cost. The metrics are not conclusive usage evidence because Redis can also support pub/sub, locks, queues, sessions, and other patterns that do not produce cache hits or misses.

Impact

Removing or resizing a cache without checking those other patterns can interrupt applications. Treat every result as an investigation, not as an automatic deletion recommendation.

Audit

This policy evaluates an Azure Cache for Redis instance based on its 30-day cache lookup metrics.

The Azure Cache for Redis instance is marked as INCOMPLIANT if:

• Monitor: Cache Hits, 30-Day = 0.
• Monitor: Cache Misses, 30-Day = 0.

The instance is marked as INAPPLICABLE if its Provisioning State is not Succeeded.

The instance is marked as UNDETERMINED if its provisioning state or either 30-day metric is unavailable.

The instance is marked as COMPLIANT if either 30-day metric is greater than 0.

An INCOMPLIANT result is a review candidate, not proof that the instance is unused, because these metrics do not capture every Redis usage pattern.

This independently evaluates Cloudaware CMDB metrics. It has no direct equivalent in the documented Azure Advisor or Defender catalogs; Redis reservation and high-load recommendations evaluate different conditions.