v0.15.0

[linkvt]

Highlights

HTTP/2 and gRPC support (#1084)

The interceptor now supports HTTP/2 (h2c and h2 over TLS), enabling autoscaling of gRPC workloads. Backend transport is selected based on the Kubernetes appProtocol field on the Service port (#1676): cleartext backends default to HTTP/1.1 unless appProtocol: kubernetes.io/h2c is set; TLS backends negotiate via ALPN.

The KEDA_HTTP_FORCE_HTTP2 environment variable has been removed — HTTP/2 is now negotiated automatically.

Cold-start placeholder responses (#874)

New coldStart.placeholder support lets you return static HTTP responses while a workload scales from zero, instead of holding the request until a pod is ready.

Scaler resilience (#1667)

The scaler now tolerates partial interceptor pod failures instead of restarting on a single unreachable endpoint. Last-known concurrency is cached for unreachable pods to prevent underreporting.

Graceful shutdown (#1636)

The interceptor now drains in-flight requests before exiting. It waits for active handlers to complete (bounded by KEDA_HTTP_DRAIN_TIMEOUT), marks the readiness probe unhealthy immediately on SIGTERM, and delays listener closure by KEDA_HTTP_SHUTDOWN_DELAY to let Kubernetes propagate endpoint removal.

Deprecations

• KEDAHTTP_OPERATOR_EXTERNAL_SCALER_SERVICE and KEDAHTTP_OPERATOR_EXTERNAL_SCALER_PORT have been renamed to KEDA_HTTP_OPERATOR_EXTERNAL_SCALER_SERVICE and KEDA_HTTP_OPERATOR_EXTERNAL_SCALER_PORT. Old names still work but log a deprecation warning. (#1623)

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Full release notes: https://github.com/kedacore/http-add-on/releases/tag/v0.15.0