How to verify your Azure Application Gateway is zone-redundant

Azure Application Gateway can provide availability-zone redundancy by distributing Standard_v2 or WAF_v2 gateway instances across multiple zones in supported regions, allowing Azure to reroute traffic if a zone fails, although it does not protect against regional outages. Zone configuration is fixed at deployment, so a single-zone gateway must be replaced and traffic migrated to become zone-redundant; applications also need retry, circuit-breaker, capacity, and data-resilience measures because Azure manages gateway failover but not the behavior of services using it. Organizations can verify configuration through the gateway’s zones property, audit deployments with Azure Resource Graph, and configure Resource Health and Service Health alerts. Azure Chaos Studio can test failures in backend compute but cannot simulate an Application Gateway zone failure directly and remains limited in scope, while network blackhole fault-injection experiments can test whether dependent applications recover when a selected zone becomes unreachable. The article also presents Gremlin Detected Risks as a continuous assessment tool for identifying insufficient zone redundancy, missing autoscaling, and soon-expiring SSL certificates, emphasizing that configuration audits and live resilience testing address different but complementary reliability risks.

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