About OpenShift Serverless

• OpenShift Serverless now uses Knative Serving 1.15.
• OpenShift Serverless now uses Knative Eventing 1.15.
• OpenShift Serverless now uses Kourier 1.15.
• OpenShift Serverless now uses Knative (kn) CLI 1.15.
• OpenShift Serverless now uses Knative for Apache Kafka 1.15.
• The kn func CLI plugin now uses func 1.16.
• Go functions using S2I builder are now available as a Generally Available (GA) feature for Linux and Mac developers, allowing them to implement and build Go functions on these platforms.
• It is now possible to automatically discover and register EventTypes based on the structure of incoming events, simplifying the overall configuration and management of EventTypes.
• Knative Event catalog is now available in OpenShift Developer Console (ODC). You can explore the catalog to discover different event types, along with their descriptions and associated metadata, making it easier to understand the system capabilities and functionalities.
• Knative Eventing now supports long-running background jobs. This feature separates resource-intensive or time-consuming tasks from the primary event processing flow, boosting application responsiveness and scalability.
• Autoscaling for Knative Kafka subscriptions is now enhanced with Kubernetes Event-Driven Autoscaling (KEDA) as a Technology Preview (TP) feature. Autoscaling with CMA/KEDA optimizes resource allocation for Kafka triggers and KafkaSource objects, boosting performance in event-driven workloads by enabling dynamic scaling of Kafka consumer resources.
• OpenShift Serverless Logic now integrates with Prometheus and Grafana to provide enhanced monitoring support.
• OpenShift Serverless Logic workflows deployed using the dev or preview profile are now automatically configured to generate monitoring metrics for Prometheus.
• The Jobs Service supporting service can now be scaled to zero by configuring the spec.services.jobService.podTemplate.replicas field in the SonataFlowPlatform custom resource (CR).
• OpenShift Serverless Logic workflows deployed with the preview and gitops profiles are now automatically configured to send grouped events to the Data Index, optimizing event traffic.
• A more comprehensive list of errors in the workflow definition is now provided, rather than only displaying the first detected error.
• OpenShift Serverless Logic is now certified for use with PostgreSQL version 15.9.
• Event performance between OpenShift Serverless Logic workflows and the Data Index is improved through event batching. Set kogito.events.grouping=true to group events. For further optimization, enable kogito.events.grouping.binary=true to reduce the size of grouped events with an alternate serialization algorithm. To compress these events, set kogito.events.grouping.compress=true, which lowers event size at the cost of additional CPU usage.
• Compensation states are now invoked when a workflow is aborted.
• OpenShift Serverless Logic now supports configuring the Knative Eventing system to produce and consume events for workflows and supporting services.
• The secret configurations for the Broker and KafkaChannel (Apache Kafka) have been unified.

• Previously, Horizontal Pod Autoscaler (HPA) scaled down the Activator component prematurely, causing long-running requests against a Knative Service to terminate. This issue is now fixed. The terminationGracePeriodSeconds value is automatically set according to the max-revision-timeout-seconds configuration for Knative revisions.

• Previously, requests to a Knative Service with a slow back end could time out because the default Red Hat OpenShift Serverless route timeout was too short. You can now configure the route HAProxy timeout by specifying an environment variable in the Operator Subscription object for OpenShift Serverless as follows:

  apiVersion: operators.coreos.com/v1alpha1
  kind: Subscription
  metadata:
    # ...
  spec:
    channel: stable
    config:
      env:
        - name: ROUTE_HAPROXY_TIMEOUT
          value: '900'

• Previously, requests to Knative Services with slow back-end responses could fail due to the default OpenShift Route timeout being too short. This issue has been addressed by making the haproxy.router.openshift.io/timeout setting configurable for automatically created routes.

  You can now adjust the timeout by setting the ROUTE_HAPROXY_TIMEOUT environment variable in the OpenShift Serverless Operator Subscription configuration as follows:

  apiVersion: operators.coreos.com/v1alpha1
  kind: Subscription
  metadata:
    ...
  spec:
    channel: stable
    config:
      env:
        - name: ROUTE_HAPROXY_TIMEOUT
          value: '900'

• Previously, long-running requests to Knative Services could be prematurely terminated if the Activator component was scaled down by using the HorizontalPodAutoscaler field. This issue has been resolved. The terminationGracePeriodSeconds field for the Activator is now automatically aligned with the max-revision-timeout-seconds setting configured for Knative revisions.

• OpenShift Serverless now uses Knative Serving 1.14.
• OpenShift Serverless now uses Knative Eventing 1.14.
• OpenShift Serverless now uses Kourier 1.14.
• OpenShift Serverless now uses Knative (kn) CLI 1.14.
• OpenShift Serverless now uses Knative for Apache Kafka 1.14.
• The kn func CLI plugin now uses func 1.15.
• OpenShift Serverless Logic now supports multiple configuration for OpenAPI within the same namespace.
• The management console for OpenShift Serverless Logic is now available as a Technology Preview (TP) feature for streamlining the development process.
• OpenShift Serverless Logic 1.34 introduces a new feature that allows workflows to access different OpenShift Container Platform clusters through configuration. This feature enables users to define REST calls within a workflow to seamlessly interact with multiple clusters.
• In OpenShift Serverless Logic, the Job Service liveness checks is now enhanced to limit the time required to retrieve the leader status. A new system property, kogito.jobs-service.management.leader-check.expiration-in-seconds, has been introduced, allowing you to configure the maximum time allowed for the leader status check.
• Automatic EventType registration is an Eventing feature is now available as a Technology Preview (TP). It automatically creates EventTypes objects based on processed events on the broker ingress and in-memory channels, improving the experience of consuming and creating EventTypes.
• Encryption Serving is now available as a Technology Preview (TP) feature.
• Startup probes are now supported, helping to reduce cold start times for faster application startup and improved performance. These probes are particularly useful for containers with slow startup processes.
• OpenShift Serverless Serving transport encryption feature allows transporting data over secured and encrypted HTTPS connections using TLS. This is now available as a Technology Preview (TP) feature.
• Go functions using S2I builder are now available as a Technology Preview (TP) feature for Linux and Mac developers, allowing them to implement and build Go functions on these platforms.
• Multi-container support for Knative Serving allows you to use a single Knative service to deploy a multi-container pod. It also supports the readiness and liveness probe values for multiple containers.
• Autoscaling for Knative Kafka triggers is now enhanced with KEDA (Kubernetes Event-Driven Autoscaling) as a Technology Preview (TP). Autoscaling using CMA/KEDA further enhances performance by optimizing resource allocation for Kafka triggers and KafkaSource objects, ensuring better scalability in event-driven workloads.
• Knative Eventing now offers support for data in transit encryption (Eventing TLS) as a Technology Preview (TP) feature. You can configure Knative Eventing components to expose HTTPS addresses as well as add user-provided CA trust bundles to clients.

• Previously, KafkaSource objects would incorrectly remain in the Ready status even when the KafkaSource.spec.net.tls.key failed to load. This issue has been resolved. An error is now reported when creating a Kafka Broker, KafkaChannel, KafkaSource, or KafkaSink object with unsupported TLS certificates in PKCS #1 (Public-Key Cryptography Standards #1) format, ensuring proper handling and notification of configuration issues.
• The Eventing controller incorrectly requeued the wrong object type (Namespace), causing "resource not found" log errors. This issue is now resolved, and the controller now handles object requeuing, ensuring more accurate logging and resource management.

• Previously, creating Knative installation resources like KnativeServing or KnativeEventing in a user namespace triggered an infinite reconciliation loop in the OpenShift Serverless Operator. This issue has been resolved by reintroducing an admission webhook that prevents the creation of Knative installation resources in any namespace other than knative-serving or knative-eventing.
• Previously, post-install batch jobs were removed after a certain period, leaving privileged service accounts unbound. This caused compliance systems to flag the issue. The problem has been resolved by retaining completed jobs, ensuring that service accounts remain bound.

• OpenShift Serverless now uses Knative Serving 1.12.
• OpenShift Serverless now uses Knative Eventing 1.12.
• OpenShift Serverless now uses Kourier 1.12.
• OpenShift Serverless now uses Knative (kn) CLI 1.12.
• OpenShift Serverless now uses Knative for Apache Kafka 1.12.
• The kn func CLI plugin now uses func 1.14.

• OpenShift Serverless Logic is now generally available (GA). This release includes an overview of OpenShift Serverless Logic; instructions on creating, running, and deploying workflows; and guidelines for the installation and uninstallation of OpenShift Serverless Logic Operator. Additionally, it includes steps for configuring OpenAPI services and endpoints, and techniques for troubleshooting the services. For more information, see OpenShift Serverless Logic overview.

  You can also refer to the additional documentation. For more details, see the Serverless Logic documentation.

• OpenShift Serverless on ARM64 is now available as Technology Preview.
• The NamespacedKafka annotation is now deprecated. Use the standard Kafka broker without data plane isolation instead.
• When enabling the automatic EventType auto-creation, you can now easily discover events available within the cluster. This functionality is available as a Developer Preview.
• You can now explore the Knative Eventing monitoring dashboards directly within the Observe tab of the developer view in the OpenShift Developer Console.
• You can now use the Custom Metrics Autoscaler Operator to autoscale Knative Eventing sources for Apache Kafka sources, defined by a KafkaSource object. This functionality is available as a Technology Preview feature, offering enhanced scalability and efficiency for Kafka-based event sources within Knative Eventing.
• You can now customize the internal Kafka topic properties when creating a Knative Broker with Kafka implementation. This improves efficiency and simplifies management.
• The new trigger filters feature is now available as a Technology Preview. These filters are enabled by default and allows users to specify a set of filter expressions, where each expression evaluates to either true or false for each event.

• Due to different mount point permissions, direct upload on a cluster build does not work on IBM zSystems (s390x) and IBM Power (ppc64le).

• Building and deploying a function using Podman version 4.6 fails with the invalid pull policy "1" error.

  To work around this issue, use Podman version 4.5.

• Previously, post-install batch jobs were removed after a certain period, leaving privileged service accounts unbound. This caused compliance systems to flag the issue. The problem has been resolved by retaining completed jobs, ensuring that service accounts remain bound.

• OpenShift Serverless now uses Knative Serving 1.11.
• OpenShift Serverless now uses Knative Eventing 1.11.
• OpenShift Serverless now uses Kourier 1.11.
• OpenShift Serverless now uses Knative (kn) CLI 1.11.
• OpenShift Serverless now uses Knative for Apache Kafka 1.11.
• The kn func CLI plugin now uses func 1.13.

• Serverless Logic, which is available as a Technology Preview (TP) feature, has been updated.

  See the Serverless Logic documentation for usage instructions.

• You can configure the OpenShift Serverless Functions readiness and liveness probe settings for the user container and queue-proxy container.
• OpenShift Serverless Functions now supports OpenShift Pipelines versions from 1.10 till 1.14 (latest). The older versions of OpenShift Pipelines are no longer compatible with OpenShift Serverless Functions.
• On-cluster function building, including using Pipelines as Code is now supported on IBM zSystems (s390x) and IBM Power (ppc64le) on OpenShift Data Foundation storage only.
• You can now subscribe a function to a set of events by using the func subscribe command. This links your function to CloudEvent objects defined by your filters and enables automated responses.
• The Knative Serving TLS encryption feature for internal traffic is now deprecated. It was a Tech Preview feature. The functionality with the internal-encryption configuration flag is no longer available and it will be replaced by new configuration flags in a future release.
• The secret filtering is enabled by default on the OpenShift Serverless Operator side. An environment variable ENABLE_SECRET_INFORMER_FILTERING_BY_CERT_UID=true, is added by default to the net-istio and net-kourier controller pods.
• The domain-mapping and domain-mapping-webhook deployments functionality in the knative-serving namespace is now removed. They are now integrated with Serving Webhook and Serving Controller.
• If you set spec.config.domain field in the KnativeServing custom resource (CR), the default external domain will no longer auto-populates the config-domain config map in the knative-serving namespace. Now, you must configure the config-domain config map manually to ensure accurate domain settings.
• You can now use the gRPC health probe for net-kourier deployments. The the Kourier Controller now uses a standard Kubernetes gRPC health probe for both readiness and liveness, replacing its previous use of exec and custom commands. The timeoutSeconds value has been adjusted from 100 milliseconds to 1 second to ensure more reliable probe responses.
• The new trigger filters feature is now available as a Technology Preview. The new trigger filters are now enabled by default. It allows users to specify a set of filter expressions, where each expression evaluates to either true or false for each event.
• Knative Eventing now offers support for data in transit encryption (Eventing TLS) as a developer preview. You can configure Knative Eventing components to expose HTTPS addresses as well as add user-provided CA trust bundles to clients.
• OpenShift Serverless now supports custom OpenShift CA bundle injection for system components. For more information, see Configuring a custom PKI.
• You can now use the Custom Metrics Autoscaler Operator to autoscale Knative Eventing sources for Apache Kafka sources. This functionality is available as a developer preview, offering enhanced scalability and efficiency for Kafka-based event sources within Knative Eventing.
• You can now explore the Knative Eventing monitoring dashboards directly within the Observe tab of the Developer view in the OpenShift Developer Console.
• The support for EventTypes v1beta1 in Knative shipped is deprecated in OpenShift Serverless 1.32. In OpenShift Serverless 1.32, the Knative CLI uses the EventType v1beta2 API to facilitate the new reference model. In previous releases, the kn CLI is not backward compatible with the EventType API v1beta1 and is limited to the kn eventtypes sub-commands group. Therefore, it is recommended to use a matching kn version for the best user experience.

• The default CPU limit is now increased for 3scale-kourier-gateways from 500m to 1s. When more than 500 Knative Service instances are created, it could lead to readiness and liveness probe failures in the 3scale-kourier-gateways pod due to CPU resource exhaustion. This adjustment aims to reduce such failures and ensures smoother operation even under heavy loads.

• Due to different mount point permissions, direct upload on a cluster build does not work on IBM zSystems (s390x) and IBM Power (ppc64le).

• Building and deploying a function using Podman version 4.6 fails with the invalid pull policy "1" error.

  To work around this issue, use Podman version 4.5.

• OpenShift Serverless now uses Knative Serving 1.10.
• OpenShift Serverless now uses Knative Eventing 1.10.
• OpenShift Serverless now uses Kourier 1.10.
• OpenShift Serverless now uses Knative (kn) CLI 1.10.
• OpenShift Serverless now uses Knative for Apache Kafka 1.10.
• The kn func CLI plug-in now uses func 1.11.
• OpenShift Serverless multi-tenancy with Service Mesh is now available as a Technology Preview (TP) feature.

• Serverless Logic, which is available as a Technology Preview (TP) feature, has been updated.

  See the Serverless Logic documentation for usage instructions.

• OpenShift Serverless can now be installed and used on single-node OpenShift.
• You can now configure a persistent volume claim (PVC) for an existing PersistentVolume object to use with a Serverless function.
• When specifying Kourier for Ingress and using DomainMapping, the TLS for OpenShift Route is set to passthrough, and TLS is handled by the Kourier Gateway. Beginning with Serverless 1.31, it is possible to specify the enabled cipher suites on the side of the Kourier Gateway.

• Integrating Red Hat OpenShift Service Mesh with Serverless when Kourier is enabled is now deprecated. Use net-istio instead of net-kourier for Service Mesh integration.

  See the "Integrating Red Hat OpenShift Service Mesh with Serverless" section for details.

• The PodDistruptionBudget and HorizontalPodAutoscaler objects have been added for the 3scale-kourier-gateway deployment.

  • PodDistruptionBudget is used to define the minimum availability requirements for pods in a deployment.
  • HorizontalPodAutoscaler is used to automatically scale the number of pods in the deployment based on demand or on your custom metrics.
• Now you can change the pattern for Apache Kafka topic names used by Knative brokers and channels for Apache Kafka.
• The DomainMapping v1alpha1 custom resource definition (CRD) is now deprecated. Use v1beta1 CRD instead.
• The NamespacedKafka annotation, which was a Technology Preview (TP) feature, is now deprecated in favor of the standard Kafka broker with no data plane isolation.

• Previously, when deploying Knative Eventing with full Red Hat OpenShift Service Mesh integration and with STRICT peer authentication, the PingSource adapter metrics were unavailable.

  This has been fixed, and the PingSource adapter metrics are now collected using a different job and service label value. The previous value was pingsource-mt-adapter, the new value is pingsource-mt-adapter-sm-service.

• OpenShift Serverless now uses Knative Serving 1.9.
• OpenShift Serverless now uses Knative Eventing 1.9.
• OpenShift Serverless now uses Kourier 1.9.
• OpenShift Serverless now uses Knative (kn) CLI 1.9.
• OpenShift Serverless now uses Knative for Apache Kafka 1.9.
• The kn func CLI plug-in now uses func 1.10.1.
• OpenShift Serverless now runs on HyperShift-hosted clusters.
• OpenShift Serverless now runs on single-node OpenShift.
• Developer Experience around OpenShift Serverless is now available through OpenShift Toolkit, an OpenShift IDE Extension for the Visual Studio Code (VSCode). The extension can be installed from the VSCode Extension Tab and VSCode Marketplace. See the Marketplace page for the Visual Studio Code OpenShift Toolkit extension.
• OpenShift Serverless Functions nows supports Red Hat OpenShift Pipelines versions 1.10 and 1.11. Older versions of Red Hat OpenShift Pipelines are no longer compatible with OpenShift Serverless Functions.

• Serverless Logic is now available as a Technology Preview (TP) feature.

  See the Serverless Logic documentation for details.

• Beginning with OpenShift Serverless 1.30.0, the following runtime environments are supported on IBM zSystems using the s2i builder:

  • NodeJS
  • Python
  • TypeScript
  • Quarkus

• Eventing integration with Red Hat OpenShift Service Mesh is now available as a Technology Preview (TP) feature.

  The integration includes the following:

  • PingSource
  • ApiServerSource
  • Knative Source for Apache Kafka
  • Knative Broker for Apache Kafka
  • Knative Sink for Apache Kafka
  • ContainerSource
  • SinkBinding
  • InMemoryChannel
  • KafkaChannel
  • Channel-based Knative Broker
• Pipelines-as-code for OpenShift Serverless Functions is now available as a Technology Preview (TP).
• You can now configure the burst and queries per second (QPS) values for net-kourier.

• OpenShift Serverless Functions users now have the ability to override the readiness and liveness probe values in the func.yaml file for individual Quarkus functions.

  See "Functions development reference guide" for guidance on Quarkus, TypeScript, and Node.js functions.

• Beginning with OpenShift Serverless 1.30.0, Kourier controller and gateway manifests have the following limits and requests by default:

  • requests:

    • cpu: 200m
    • memory: 200Mi

  • limits:

    • cpu: 500m

    • memory: 500Mi

      See the "Overriding Knative Serving system deployment configurations" section of OpenShift Serverless documentation.

• The NamespacedKafka annotation, which was a Technology Preview (TP) feature, is now deprecated in favor of the standard Kafka broker with no data plane isolation.

• Previously, the 3scale-kourier-gateway pod was sending thousands of net-kourier-controller DNS queries daily. New queries were being sent for each NXDOMAIN reply. This continued until the correct DNS query was produced.

  The query now has the net-kourier-controller.knative-serving-ingress.svc.<cluster domain>. fully-qualified domain name (FQDN) by default, which solves the problem.

• Building and deploying a function using Podman version 4.6 fails with the invalid pull policy "1" error.

  To work around this issue, use Podman version 4.5.

• On-cluster function building, including using Pipelines-as-code, is not supported on IBM zSystems and IBM Power.
• Buildpack builder is not supported on IBM zSystems and IBM Power.

• Previously, the net-kourier-controller sometimes failed to start due to the liveness probe error. This has been fixed.

• OpenShift Serverless now uses Knative Serving 1.8.
• OpenShift Serverless now uses Knative Eventing 1.8.
• OpenShift Serverless now uses Kourier 1.8.
• OpenShift Serverless now uses Knative (kn) CLI 1.8.
• OpenShift Serverless now uses Knative for Apache Kafka 1.8.
• The kn func CLI plug-in now uses func 1.10.

• Beginning with OpenShift Serverless 1.29, the different product versions are available as follows:

  • The latest release is available through the stable channel.

  • Releases older than the latest are available through the version-based channels.

    To use these, update the channel parameter in the subscription object YAML file from stable to the corresponding version-based channel, such as stable-1.29.

    This change allows you to receive updates not only for the latest release, but also for releases in the Maintenance phase.

    Additionally, you can lock the version of the Knative (kn) CLI. For details, see section "Installing the Knative CLI".

• You can now create OpenShift Serverless functions through developer console using OpenShift Container Platform Pipelines.
• Multi-container support for Knative Serving is now generally available (GA). This feature allows you to use a single Knative service to deploy a multi-container pod.
• OpenShift Serverless functions can now override the readiness and liveness probe values in the func.yaml file for individual Node.js and TypeScript functions.
• You can now configure your function to re-deploy automatically to the cluster when its source code changes in the GitHub repository. This allows for more seamless CI/CD integration.
• Eventing integration with Service Mesh is now available as developer preview feature. The integration includes: PingSource, ApiServerSource, Knative Source for Apache Kafka, Knative Broker for Apache Kafka, Knative Sink for Apache Kafka, ContainerSource, and SinkBinding.
• This release includes the upgraded Developer Preview for OpenShift Serverless Logic.
• API version v1alpha1 of the Knative Operator Serving and Eventings CRDs has been removed. You need to use the v1beta1 version instead. This does not affect the existing installations, because CRDs are updated automatically when upgrading the Serverless Operator.

• When updating the secret specified in DomainMapping, simply updating the secret does not trigger the reconcile loop. You need to either rename the secret or delete the Knative Ingress resource to trigger the reconcile loop.
• Webhook Horizontal Pod Autoscaler (HPA) settings are overridden by the OpenShift Serverless Operator. As a result, it fails to scale for higher workloads. To work around this issue, manually set the initial replica value that corresponds to your workload.
• KafkaSource resources created before Red Hat OpenShift Serverless 1.27 get stuck when being deleted. To work around the issue, after starting to delete a KafkaSource, remove the finalizer from the resource.
• The net-kourier-controller might not be able to start due to the liveness probe error. You can work around the problem using the Knowledgebase solution.

• OpenShift Serverless now uses Knative Serving 1.7.
• OpenShift Serverless now uses Knative Eventing 1.7.
• OpenShift Serverless now uses Kourier 1.7.
• OpenShift Serverless now uses Knative (kn) CLI 1.7.
• OpenShift Serverless now uses Knative broker implementation for Apache Kafka 1.7.
• The kn func CLI plug-in now uses func 1.9.1 version.
• Node.js and TypeScript runtimes for OpenShift Serverless Functions are now Generally Available (GA).
• Python runtime for OpenShift Serverless Functions is now available as a Technology Preview.
• Multi-container support for Knative Serving is now available as a Technology Preview. This feature allows you to use a single Knative service to deploy a multi-container pod.

• In OpenShift Serverless 1.29 or later, the following components of Knative Eventing will be scaled down from two pods to one:

  • imc-controller
  • imc-dispatcher
  • mt-broker-controller
  • mt-broker-filter
  • mt-broker-ingress

• The serverless.openshift.io/enable-secret-informer-filtering annotation for the Serving CR is now deprecated. The annotation is valid only for Istio, and not for Kourier.

  With OpenShift Serverless 1.28, the OpenShift Serverless Operator allows injecting the environment variable ENABLE_SECRET_INFORMER_FILTERING_BY_CERT_UID for both net-istio and net-kourier.

  If you enable secret filtering, all of your secrets need to be labeled with networking.internal.knative.dev/certificate-uid: "<id>". Otherwise, Knative Serving does not detect them, which leads to failures. You must label both new and existing secrets.

  In one of the following OpenShift Serverless releases, secret filtering will become enabled by default. To prevent failures, label your secrets in advance.

• Currently, runtimes for Python are not supported for OpenShift Serverless Functions on IBM Power, IBM zSystems, and IBM® LinuxONE.

  Node.js, TypeScript, and Quarkus functions are supported on these architectures.

• On the Windows platform, Python functions cannot be locally built, run, or deployed using the Source-to-Image builder due to the app.sh file permissions.

  To work around this problem, use the Windows Subsystem for Linux.

• KafkaSource resources created before Red Hat OpenShift Serverless 1.27 get stuck when being deleted. To work around the issue, after starting to delete a KafkaSource, remove the finalizer from the resource.

• OpenShift Serverless now uses Knative Serving 1.6.
• OpenShift Serverless now uses Knative Eventing 1.6.
• OpenShift Serverless now uses Kourier 1.6.
• OpenShift Serverless now uses Knative (kn) CLI 1.6.
• OpenShift Serverless now uses Knative Kafka 1.6.
• The kn func CLI plug-in now uses func 1.8.1.
• Namespace-scoped brokers are now available as a Technology Preview. Such brokers can be used, for instance, to implement role-based access control (RBAC) policies.
• KafkaSink now uses the CloudEvent binary content mode by default. The binary content mode is more efficient than the structured mode because it uses headers in its body instead of a CloudEvent. For example, for the HTTP protocol, it uses HTTP headers.
• You can now use the gRPC framework over the HTTP/2 protocol for external traffic using the OpenShift Route on OpenShift Container Platform 4.10 and later. This improves efficiency and speed of the communications between the client and server.
• API version v1alpha1 of the Knative Operator Serving and Eventings CRDs is deprecated in 1.27. It will be removed in future versions. Red Hat strongly recommends to use the v1beta1 version instead. This does not affect the existing installations, because CRDs are updated automatically when upgrading the Serverless Operator.
• The delivery timeout feature is now enabled by default. It allows you to specify the timeout for each sent HTTP request. The feature remains a Technology Preview.

• Previously, Knative services sometimes did not get into the Ready state, reporting waiting for the load balancer to be ready. This issue has been fixed.

• Integrating OpenShift Serverless with Red Hat OpenShift Service Mesh causes the net-kourier pod to run out of memory on startup when too many secrets are present on the cluster.

• Namespace-scoped brokers might leave ClusterRoleBindings in the user namespace even after deletion of namespace-scoped brokers.

  If this happens, delete the ClusterRoleBinding named rbac-proxy-reviews-prom-rb-knative-kafka-broker-data-plane-{{.Namespace}} in the user namespace.

• OpenShift Serverless Functions with Quarkus is now GA.
• OpenShift Serverless now uses Knative Serving 1.5.
• OpenShift Serverless now uses Knative Eventing 1.5.
• OpenShift Serverless now uses Kourier 1.5.
• OpenShift Serverless now uses Knative (kn) CLI 1.5.
• OpenShift Serverless now uses Knative Kafka 1.5.
• OpenShift Serverless now uses Knative Operator 1.3.
• The kn func CLI plugin now uses func 1.8.1.
• Persistent volume claims (PVCs) are now GA. PVCs provide permanent data storage for your Knative services.

• The new trigger filters feature is now available as a Developer Preview. It allows users to specify a set of filter expressions, where each expression evaluates to either true or false for each event.

  To enable new trigger filters, add the new-trigger-filters: enabled entry in the section of the KnativeEventing type in the operator config map:

  apiVersion: operator.knative.dev/v1beta1
  kind: KnativeEventing
  ...
  ...
  spec:
    config:
      features:
        new-trigger-filters: enabled
  ...

• Knative Operator 1.3 adds the updated v1beta1 version of the API for operator.knative.dev.

  To update from v1alpha1 to v1beta1 in your KnativeServing and KnativeEventing custom resource config maps, edit the apiVersion key:

  Example KnativeServing custom resource config map

  apiVersion: operator.knative.dev/v1beta1
  kind: KnativeServing
  ...

  Example KnativeEventing custom resource config map

  apiVersion: operator.knative.dev/v1beta1
  kind: KnativeEventing
  ...

• Previously, Federal Information Processing Standards (FIPS) mode was disabled for Kafka broker, Kafka source, and Kafka sink. This has been fixed, and FIPS mode is now available.

• OpenShift Serverless now uses Knative Serving 1.4.
• OpenShift Serverless now uses Knative Eventing 1.4.
• OpenShift Serverless now uses Kourier 1.4.
• OpenShift Serverless now uses Knative (kn) CLI 1.4.
• OpenShift Serverless now uses Knative Kafka 1.4.
• The kn func CLI plugin now uses func 1.7.0.
• Integrated development environment (IDE) plugins for creating and deploying functions are now available for Visual Studio Code and IntelliJ.

• Knative Kafka broker is now GA. Knative Kafka broker is a highly performant implementation of the Knative broker API, directly targeting Apache Kafka.

  It is recommended to not use the MT-Channel-Broker, but the Knative Kafka broker instead.

• Knative Kafka sink is now GA. A KafkaSink takes a CloudEvent and sends it to an Apache Kafka topic. Events can be specified in either structured or binary content modes.
• Enabling TLS for internal traffic is now available as a Technology Preview.

• Previously, Knative Serving had an issue where the readiness probe failed if the container was restarted after a liveness probe fail. This issue has been fixed.

• The Federal Information Processing Standards (FIPS) mode is disabled for Kafka broker, Kafka source, and Kafka sink.
• The SinkBinding object does not support custom revision names for services.

• The Knative Serving Controller pod adds a new informer to watch secrets in the cluster. The informer includes the secrets in the cache, which increases memory consumption of the controller pod.

  If the pod runs out of memory, you can work around the issue by increasing the memory limit for the deployment.

• OpenShift Serverless now uses Knative Serving 1.3.
• OpenShift Serverless now uses Knative Eventing 1.3.
• OpenShift Serverless now uses Kourier 1.3.
• OpenShift Serverless now uses Knative kn CLI 1.3.
• OpenShift Serverless now uses Knative Kafka 1.3.
• The kn func CLI plugin now uses func 0.24.
• Init containers support for Knative services is now generally available (GA).
• OpenShift Serverless logic is now available as a Developer Preview. It enables defining declarative workflow models for managing serverless applications.
• For OpenShift Container Platform, you can now use the cost management service with OpenShift Serverless.

• Integrating OpenShift Serverless with Red Hat OpenShift Service Mesh causes the net-istio-controller pod to run out of memory on startup when too many secrets are present on the cluster.

  It is now possible to enable secret filtering, which causes net-istio-controller to consider only secrets with a networking.internal.knative.dev/certificate-uid label, thus reducing the amount of memory needed.

• The OpenShift Serverless Functions Technology Preview now uses Cloud Native Buildpacks by default to build container images.

• The Federal Information Processing Standards (FIPS) mode is disabled for Kafka broker, Kafka source, and Kafka sink.

• In OpenShift Serverless 1.23, support for KafkaBindings and the kafka-binding webhook were removed. However, an existing kafkabindings.webhook.kafka.sources.knative.dev MutatingWebhookConfiguration might remain, pointing to the kafka-source-webhook service, which no longer exists.

  For certain specifications of KafkaBindings on the cluster, kafkabindings.webhook.kafka.sources.knative.dev MutatingWebhookConfiguration might be configured to pass any create and update events to various resources, such as Deployments, Knative Services, or Jobs, through the webhook, which would then fail.

  To work around this issue, manually delete kafkabindings.webhook.kafka.sources.knative.dev MutatingWebhookConfiguration from the cluster after upgrading to OpenShift Serverless 1.23:

  $ oc delete mutatingwebhookconfiguration kafkabindings.webhook.kafka.sources.knative.dev

• OpenShift Serverless now uses Knative Serving 1.2.
• OpenShift Serverless now uses Knative Eventing 1.2.
• OpenShift Serverless now uses Kourier 1.2.
• OpenShift Serverless now uses Knative (kn) CLI 1.2.
• OpenShift Serverless now uses Knative Kafka 1.2.
• The kn func CLI plugin now uses func 0.24.
• It is now possible to use the kafka.eventing.knative.dev/external.topic annotation with the Kafka broker. This annotation makes it possible to use an existing externally managed topic instead of the broker creating its own internal topic.
• The kafka-ch-controller and kafka-webhook Kafka components no longer exist. These components have been replaced by the kafka-webhook-eventing component.
• The OpenShift Serverless Functions Technology Preview now uses Source-to-Image (S2I) by default to build container images.

• The Federal Information Processing Standards (FIPS) mode is disabled for Kafka broker, Kafka source, and Kafka sink.
• If you delete a namespace that includes a Kafka broker, the namespace finalizer may fail to be removed if the broker’s auth.secret.ref.name secret is deleted before the broker.

• Running OpenShift Serverless with a large number of Knative services can cause Knative activator pods to run close to their default memory limits of 600MB. These pods might be restarted if memory consumption reaches this limit. Requests and limits for the activator deployment can be configured by modifying the KnativeServing custom resource:

  apiVersion: operator.knative.dev/v1beta1
  kind: KnativeServing
  metadata:
    name: knative-serving
    namespace: knative-serving
  spec:
    deployments:
    - name: activator
      resources:
      - container: activator
        requests:
          cpu: 300m
          memory: 60Mi
        limits:
          cpu: 1000m
          memory: 1000Mi

• If you are using Cloud Native Buildpacks as the local build strategy for a function, kn func is unable to automatically start podman or use an SSH tunnel to a remote daemon. The workaround for these issues is to have a Docker or podman daemon already running on the local development computer before deploying a function.
• On-cluster function builds currently fail for Quarkus and Golang runtimes. They work correctly for Node, Typescript, Python, and Springboot runtimes.

• OpenShift Serverless now uses Knative Serving 1.1.
• OpenShift Serverless now uses Knative Eventing 1.1.
• OpenShift Serverless now uses Kourier 1.1.
• OpenShift Serverless now uses Knative (kn) CLI 1.1.
• OpenShift Serverless now uses Knative Kafka 1.1.
• The kn func CLI plugin now uses func 0.23.
• Init containers support for Knative services is now available as a Technology Preview.
• Persistent volume claim (PVC) support for Knative services is now available as a Technology Preview.
• The knative-serving, knative-serving-ingress, knative-eventing and knative-kafka system namespaces now have the knative.openshift.io/part-of: "openshift-serverless" label by default.
• The Knative Eventing - Kafka Broker/Trigger dashboard has been added, which allows visualizing Kafka broker and trigger metrics in the web console.
• The Knative Eventing - KafkaSink dashboard has been added, which allows visualizing KafkaSink metrics in the web console.
• The Knative Eventing - Broker/Trigger dashboard is now called Knative Eventing - Channel-based Broker/Trigger.
• The knative.openshift.io/part-of: "openshift-serverless" label has substituted the knative.openshift.io/system-namespace label.
• Naming style in Knative Serving YAML configuration files changed from camel case (ExampleName) to hyphen style (example-name). Beginning with this release, use the hyphen style notation when creating or editing Knative Serving YAML configuration files.

• The Federal Information Processing Standards (FIPS) mode is disabled for Kafka broker, Kafka source, and Kafka sink.

• OpenShift Serverless now uses Knative Serving 1.0
• OpenShift Serverless now uses Knative Eventing 1.0.
• OpenShift Serverless now uses Kourier 1.0.
• OpenShift Serverless now uses Knative (kn) CLI 1.0.
• OpenShift Serverless now uses Knative Kafka 1.0.
• The kn func CLI plugin now uses func 0.21.
• The Kafka sink is now available as a Technology Preview.
• The Knative open source project has begun to deprecate camel-cased configuration keys in favor of using kebab-cased keys consistently. As a result, the defaultExternalScheme key, previously mentioned in the OpenShift Serverless 1.18.0 release notes, is now deprecated and replaced by the default-external-scheme key. Usage instructions for the key remain the same.

• In OpenShift Serverless 1.20.0, there was an event delivery issue affecting the use of kn event send to send events to a service. This issue is now fixed.
• In OpenShift Serverless 1.20.0 (func 0.20), TypeScript functions created with the http template failed to deploy on the cluster. This issue is now fixed.
• In OpenShift Serverless 1.20.0 (func 0.20), deploying a function using the gcr.io registry failed with an error. This issue is now fixed.
• In OpenShift Serverless 1.20.0 (func 0.20), creating a Springboot function project directory with the kn func create command and then running the kn func build command failed with an error message. This issue is now fixed.
• In OpenShift Serverless 1.19.0 (func 0.19), some runtimes were unable to build a function by using podman. This issue is now fixed.

• Currently, the domain mapping controller cannot process the URI of a broker, which contains a path that is currently not supported.

  This means that, if you want to use a DomainMapping custom resource (CR) to map a custom domain to a broker, you must configure the DomainMapping CR with the broker’s ingress service, and append the exact path of the broker to the custom domain:

  Example DomainMapping CR

  apiVersion: serving.knative.dev/v1alpha1
  kind: DomainMapping
  metadata:
    name: <domain-name>
    namespace: knative-eventing
  spec:
    ref:
      name: broker-ingress
      kind: Service
      apiVersion: v1

  The URI for the broker is then <domain-name>/<broker-namespace>/<broker-name>.

• OpenShift Serverless now uses Knative Serving 0.26.
• OpenShift Serverless now uses Knative Eventing 0.26.
• OpenShift Serverless now uses Kourier 0.26.
• OpenShift Serverless now uses Knative (kn) CLI 0.26.
• OpenShift Serverless now uses Knative Kafka 0.26.
• The kn func CLI plugin now uses func 0.20.

• The Kafka broker is now available as a Technology Preview.

  Important

  The Kafka broker, which is currently in Technology Preview, is not supported on FIPS.

• The kn event plugin is now available as a Technology Preview.
• The --min-scale and --max-scale flags for the kn service create command have been deprecated. Use the --scale-min and --scale-max flags instead.

• OpenShift Serverless deploys Knative services with a default address that uses HTTPS. When sending an event to a resource inside the cluster, the sender does not have the cluster certificate authority (CA) configured. This causes event delivery to fail, unless the cluster uses globally accepted certificates.

  For example, an event delivery to a publicly accessible address works:

  $ kn event send --to-url https://ce-api.foo.example.com/

  On the other hand, this delivery fails if the service uses a public address with an HTTPS certificate issued by a custom CA:

  $ kn event send --to Service:serving.knative.dev/v1:event-display

  Sending an event to other addressable objects, such as brokers or channels, is not affected by this issue and works as expected.

• The Kafka broker currently does not work on a cluster with Federal Information Processing Standards (FIPS) mode enabled.

• If you create a Springboot function project directory with the kn func create command, subsequent running of the kn func build command fails with this error message:

  [analyzer] no stack metadata found at path ''
  [analyzer] ERROR: failed to : set API for buildpack 'paketo-buildpacks/ca-certificates@3.0.2': buildpack API version '0.7' is incompatible with the lifecycle

  As a workaround, you can change the builder property to gcr.io/paketo-buildpacks/builder:base in the function configuration file func.yaml.

• Deploying a function using the gcr.io registry fails with this error message:

  Error: failed to get credentials: failed to verify credentials: status code: 404

  As a workaround, use a different registry than gcr.io, such as quay.io or docker.io.

• TypeScript functions created with the http template fail to deploy on the cluster.

  As a workaround, in the func.yaml file, replace the following section:

  buildEnvs: []

  with this:

  buildEnvs:
  - name: BP_NODE_RUN_SCRIPTS
    value: build

• In func version 0.20, some runtimes might be unable to build a function by using podman. You might see an error message similar to the following:

  ERROR: failed to image: error during connect: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/info": EOF

  • The following workaround exists for this issue:

    1. Update the podman service by adding --time=0 to the service ExecStart definition:

       Example service configuration

       ExecStart=/usr/bin/podman $LOGGING system service --time=0

    2. Restart the podman service by running the following commands:

       $ systemctl --user daemon-reload

       $ systemctl restart --user podman.socket

  • Alternatively, you can expose the podman API by using TCP:

    $ podman system service --time=0 tcp:127.0.0.1:5534 &
    export DOCKER_HOST=tcp://127.0.0.1:5534

• OpenShift Serverless now uses Knative Serving 0.25.
• OpenShift Serverless now uses Knative Eventing 0.25.
• OpenShift Serverless now uses Kourier 0.25.
• OpenShift Serverless now uses Knative (kn) CLI 0.25.
• OpenShift Serverless now uses Knative Kafka 0.25.
• The kn func CLI plugin now uses func 0.19.
• The KafkaBinding API is deprecated in OpenShift Serverless 1.19.0 and will be removed in a future release.
• HTTPS redirection is now supported and can be configured either globally for a cluster or per each Knative service.

• In previous releases, the Kafka channel dispatcher waited only for the local commit to succeed before responding, which might have caused lost events in the case of an Apache Kafka node failure. The Kafka channel dispatcher now waits for all in-sync replicas to commit before responding.

• In func version 0.19, some runtimes might be unable to build a function by using podman. You might see an error message similar to the following:

  ERROR: failed to image: error during connect: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/info": EOF

  • The following workaround exists for this issue:

    1. Update the podman service by adding --time=0 to the service ExecStart definition:

       Example service configuration

       ExecStart=/usr/bin/podman $LOGGING system service --time=0

    2. Restart the podman service by running the following commands:

       $ systemctl --user daemon-reload

       $ systemctl restart --user podman.socket

  • Alternatively, you can expose the podman API by using TCP:

    $ podman system service --time=0 tcp:127.0.0.1:5534 &
    export DOCKER_HOST=tcp://127.0.0.1:5534

• OpenShift Serverless now uses Knative Serving 0.24.0.
• OpenShift Serverless now uses Knative Eventing 0.24.0.
• OpenShift Serverless now uses Kourier 0.24.0.
• OpenShift Serverless now uses Knative (kn) CLI 0.24.0.
• OpenShift Serverless now uses Knative Kafka 0.24.7.
• The kn func CLI plugin now uses func 0.18.0.

• In the upcoming OpenShift Serverless 1.19.0 release, the URL scheme of external routes will default to HTTPS for enhanced security.

  If you do not want this change to apply for your workloads, you can override the default setting before upgrading to 1.19.0, by adding the following YAML to your KnativeServing custom resource (CR):

  ...
  spec:
    config:
      network:
        defaultExternalScheme: "http"
  ...

  If you want the change to apply in 1.18.0 already, add the following YAML:

  ...
  spec:
    config:
      network:
        defaultExternalScheme: "https"
  ...

• In the upcoming OpenShift Serverless 1.19.0 release, the default service type by which the Kourier Gateway is exposed will be ClusterIP and not LoadBalancer.

  If you do not want this change to apply to your workloads, you can override the default setting before upgrading to 1.19.0, by adding the following YAML to your KnativeServing custom resource (CR):

  ...
  spec:
    ingress:
      kourier:
        service-type: LoadBalancer
  ...

• You can now use emptyDir volumes with OpenShift Serverless. See the OpenShift Serverless documentation about Knative Serving for details.
• Rust templates are now available when you create a function using kn func.

• The prior 1.4 version of Camel-K was not compatible with OpenShift Serverless 1.17.0. The issue in Camel-K has been fixed, and Camel-K version 1.4.1 can be used with OpenShift Serverless 1.17.0.

• Previously, if you created a new subscription for a Kafka channel, or a new Kafka source, a delay was possible in the Kafka data plane becoming ready to dispatch messages after the newly created subscription or sink reported a ready status.

  As a result, messages that were sent during the time when the data plane was not reporting a ready status, might not have been delivered to the subscriber or sink.

  In OpenShift Serverless 1.18.0, the issue is fixed and the initial messages are no longer lost. For more information about the issue, see Knowledgebase Article #6343981.

• Older versions of the Knative kn CLI might use older versions of the Knative Serving and Knative Eventing APIs. For example, version 0.23.2 of the kn CLI uses the v1alpha1 API version.

  On the other hand, newer releases of OpenShift Serverless might no longer support older API versions. For example, OpenShift Serverless 1.18.0 no longer supports version v1alpha1 of the kafkasources.sources.knative.dev API.

  Consequently, using an older version of the Knative kn CLI with a newer OpenShift Serverless might produce an error because the kn cannot find the outdated API. For example, version 0.23.2 of the kn CLI does not work with OpenShift Serverless 1.18.0.

  To avoid issues, use the latest kn CLI version available for your OpenShift Serverless release. For OpenShift Serverless 1.18.0, use Knative kn CLI 0.24.0.

• Simplified deployment of serverless containers
• Traffic-based auto-scaling, including scale-to-zero
• Routing and network programming
• Point-in-time application snapshots and their configurations

• Services are loosely coupled during development and deployed independently to production.
• A producer can generate events before a consumer is listening, and a consumer can express an interest in an event or class of events that are not yet being produced.
• Services can be connected to create new applications without modifying producer or consumer, and with the ability to select a specific subset of events from a particular producer.

• Support for the following build strategies:

  • Source-to-Image (S2I)
  • Buildpacks
• Multiple runtimes
• Local developer experience through the Knative (kn) CLI
• Project templates
• Support for receiving CloudEvents and plain HTTP requests

• Support for managing the following Knative Serving features:

  • Services
  • Revisions
  • Routes

• Support for managing the following Knative Eventing entities:

  • Sources
  • Brokers
  • Triggers
  • Channels
  • Subscriptions
• A plugin architecture based on the design of the Kubernetes (kubectl) CLI tool
• Integration of Knative into Tekton pipelines

• Resource definitions
• Service logs

• To collect data related to one or more specific features, use the --image argument with an image, as listed in a following section.

  For example:

  $ oc adm must-gather  --image=registry.redhat.io/container-native-virtualization/cnv-must-gather-rhel8:v4.13.0

• To collect the audit logs, use the -- /usr/bin/gather_audit_logs argument, as described in a following section.

  For example:

  $ oc adm must-gather -- /usr/bin/gather_audit_logs

  Note

  Audit logs are not collected as part of the default set of information to reduce the size of the files.

Prerequisites

• Install the OpenShift CLI (oc).

Procedure

• Collect data by using the oc adm must-gather command:

  $ oc adm must-gather --image=registry.redhat.io/openshift-serverless-1/serverless-must-gather-rhel8:<image_version_tag>

  Example command

  $ oc adm must-gather --image=registry.redhat.io/openshift-serverless-1/serverless-must-gather-rhel8:1.35.0