release blog for 0.26 (#4323)

* release blog for 0.26 Signed-off-by: Carlos Santana <csantana23@gmail.com> * make linter happy Signed-off-by: Carlos Santana <csantana23@gmail.com> * remove dupe contributors Signed-off-by: Carlos Santana <csantana23@gmail.com> * fix link displays Signed-off-by: Carlos Santana <csantana23@gmail.com> * Update blog/releases/announcing-knative-v0-26-release.md Co-authored-by: Omer B <obensaadon@vmware.com>
2021-10-05 08:37:53 -04:00 · 2021-10-05 08:37:53 -04:00 · b8a9f62b4d
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+---
+title: "v0.26 release"
+linkTitle: "v0.26 release"
+Author: "[Carlos Santana](https://twitter.com/csantanapr)"
+Author handle: https://github.com/csantanapr
+date: 2021-10-04
+description: "Knative v0.26 release announcement"
+type: "blog"
+image: knative-eventing.png
+---
+
+
+### Announcing Knative v0.26 Release
+
+A new version of Knative is now available across multiple components.
+
+Follow the instructions in the documentation
+[Installing Knative](https://knative.dev/docs/admin/install/) for the respective component.
+
+#### Table of Contents
+- [Highlights](#highlights)
+- [Serving v0.26](#Serving-v026)
+- [Eventing v0.26](#Eventing-v026)
+- [Eventing Extensions](#Eventing-Extensions)
+    - [Apache Kafka Broker v0.26](#Apache-Kafka-Broker-v026)
+    - [Apache Kafka Source and Channels v0.26](#apache-kafka-source-and-channels-v026)
+    - [Eventing Kogito v0.26](#eventing-kogito-v026)
+- `kn` [CLI v0.26](#Client-v026)
+- [Operator v0.26](#Operator-v026)
+- [Thank you contributors](#Thank-you-contributors)
+
+
+### Highlights
+
+- **Kubernetes 1.20+ is now required**
+- Improvements for Istio mesh compatibility mode.
+- New features in eventing kafka
+- New CLI plugins available
+- Many improvements in install operator
+
+
+
+
+
+### Serving v0.26
+
+<!-- Original notes are here: https://github.com/knative/serving/releases/tag/v0.26.0 -->
+
+#### 🚨 Breaking or Notable Changes
+
+- **Kubernetes 1.20+ is now required**
+
+#### 💫 New Features & Changes
+
+- Allow users to set container[*].securityContext.runAsGroup ([#12003](https://github.com/knative/serving/pull/12003))
+- A new setting, `mesh-compatibility-mode`, in the networking config map allows an administrator
+to explicitly tell Activator and Autoscaler to use Direct Pod IP (most efficient, but not compatible
+with mesh being enabled), Cluster IP (less efficient, but needed if mesh is enabled), or to
+Autodetect (the current behaviour, and the default, causes Activator and Autoscaler to first attempt
+Direct Pod IP communication, and then fall back to Cluster IP if it sees a mesh-related error status
+code). ([#11999](https://github.com/knative/serving/pull/11999))
+- Adds more debug logs to background digest resolver ([#11959](https://github.com/knative/serving/pull/11959))
+- Dropped the startup probe on the queue-proxy which makes the pods start ~500ms quicker on average. ([#11965](https://github.com/knative/serving/pull/11965))
+- Removes the ServiceName field from RevisionStatus which has been deprecated for several releases. This field was effectively equal to the revision name. ([#11817](https://github.com/knative/serving/pull/11817))
+- When enabled, queue proxy tracks the request count for each pod (disabled by default) ([#11783](https://github.com/knative/serving/pull/11783))
+
+#### 🐞 Bug Fixes
+
+- User-supplied readinessProbes with a probePeriod set greater than zero are no longer silently ignored after pod startup. ([#11190](https://github.com/knative/serving/pull/11190))
+### Eventing v0.26
+
+<!-- Original notes are here: https://github.com/knative/eventing/releases/tag/v0.26.1 -->
+
+#### 🚨 Breaking or Notable Changes
+
+- **Kubernetes 1.20+ is now required**
+
+#### 💫 New Features & Changes
+
+- Add new `kreference-naming` experimental feature. When enabled, it allows overriding the default Knative reference resolver behavior. See the document for more details. ([#5599](https://github.com/knative/eventing/pull/5599))
+- The heartbeats sample app now supports Golang-style time durations as the period interval ([#5683](https://github.com/knative/eventing/pull/5683))
+- Dead Letter Sink CloudEvents from certain Channels will include the `knativeerrordest` extension attribute indicating the original destination URL of the failed event. ([#5727](https://github.com/knative/eventing/pull/5727))
+- Event Display and Heartbeats sample programs will emit traces to a trace endpoint if it's configured ([#5631](https://github.com/knative/eventing/pull/5631))
+- Traces are exported by the mtbroker controller ([#5634](https://github.com/knative/eventing/pull/5634))
+- Trigger accepts a timeout field in its delivery parameters `spec.delivery.timeout` ([#5687](https://github.com/knative/eventing/pull/5687))
+
+#### 🐞 Bug Fixes
+
+- Validate CloudEvent overrides as defined by the CloudEvent spec. ([#5730](https://github.com/knative/eventing/pull/5730))
+- Fix DeadLetterSinkURI not persisting to Trigger status ([#5642](https://github.com/knative/eventing/pull/5642))
+
+#### 🧹 Clean up
+
+- NewListableTracker is deprecated, use NewListableTrackerFromTracker instead. ([#5651](https://github.com/knative/eventing/pull/5651))
+- Adopted app.kubernetes.io labels ([#5628](https://github.com/knative/eventing/pull/5628))
+- Clarify the semantic of `ceOverrides` ([#5641](https://github.com/knative/eventing/pull/5641))
+- The post job is now having a generated name, instead of an unmaintained versioned name. ([#5664](https://github.com/knative/eventing/pull/5664))
+
+### Eventing Extensions
+
+#### Apache Kafka Broker v0.26
+
+<!-- Original notes are here: https://github.com/knative-sandbox/eventing-kafka-broker/releases/tag/v0.26.0 -->
+
+##### 🚨 Breaking or Notable Changes
+
+- **Kubernetes 1.20+ is now required**
+
+##### 🐞 Bug Fixes
+
+- The fields Broker.spec.delivery.deadLetterSink.ref.namespace and Trigger.spec.delivery.deadLetterSink.ref.namespace are optional. By default the controller uses the object namespace. ([#1254](https://github.com/knative-sandbox/eventing-kafka-broker/pull/1254))
+
+#### Apache Kafka Source and Channels v0.26
+
+<!-- Original notes are here: https://github.com/knative-sandbox/eventing-kafka/releases/tag/v0.26.1 -->
+
+##### 💫 New Features & Changes
+
+- KafkaChannel CRD Spec now includes a RetentionDuration field, allowing per-channel control over retention. A Post-Install Job (config/post-install/retentionupdate) is available to migrate existing KafkaChannels forward by populating this field. The "topic" configuration defaults which were not working have been removed from the config-kafka ConfigMap. ([#828](https://github.com/knative-sandbox/eventing-kafka/pull/828))
+- KafkaChannel ConfigMap now supports custom Labels and Annotations for dynamically generated resources. ([#806](https://github.com/knative-sandbox/eventing-kafka/pull/806))
+- Provide an option for the user to specify the initial offset for a consumer group in Kafka source, this field is honored only if there are no prior offsets committed for the consumer group. ([#779](https://github.com/knative-sandbox/eventing-kafka/pull/779))
+- KafkaSource now supports ceOverrides. ([#811](https://github.com/knative-sandbox/eventing-kafka/pull/811))
+- The Multi-tenant `KafkaSource` calculates an optimal maximum allowed replica number based on Kafka source partitions count so that scheduler does not schedule more vreplicas than the calculated number ([#822](https://github.com/knative-sandbox/eventing-kafka/pull/822))
+- Autoscaling annotations can now be automatically added to KafkaSource objects. See the documentation for more details. ([#855](https://github.com/knative-sandbox/eventing-kafka/pull/855))
+
+##### 🐞 Bug Fixes
+
+- Fix bug: status.address of KafkaChannel is not required anymore, thus conditions are reflected successfully in case of an early stage error ([#857](https://github.com/knative-sandbox/eventing-kafka/pull/857))
+- Remove confusing error message `Kafka source is not ready`. This error is returned as an event regardless the Kafka source has any real issue or not and users should not see this error message unless it is a legitimate error or it is an error they can fix. ([#809](https://github.com/knative-sandbox/eventing-kafka/pull/809))
+- multi-tenant source webhook cluster role has update permission for namespaces/finalizers. ([#854](https://github.com/knative-sandbox/eventing-kafka/pull/854))
+
+##### 🧹 Clean up
+
+- Inherent immutability of KafkaChannel and ResetOffset spec fields is now enforced by the kafka-webhook. ([#863](https://github.com/knative-sandbox/eventing-kafka/pull/863))
+- Next generation Multi-Tenant Scheduler and Descheduler: uses a plugin interface to specify a Scheduler profile with predicates and priorities that run filtering and scoring of pods, respectively to compute the best vreplica placements. When the autoscaler adds new pods, scheduler performs a rebalancing of the already placed vreplicas along with the new vreplicas. A Descheduler profile must be installed when vreplicas need to be scaled down and placements removed. ([#768](https://github.com/knative-sandbox/eventing-kafka/pull/768))
+- The consolidated KafkaChannel dispatcher is now owned by the controller. ([#798](https://github.com/knative-sandbox/eventing-kafka/pull/798))
+
+#### Eventing Kogito v0.26
+
+<!-- Original notes are here: https://github.com/knative-sandbox/eventing-kogito/releases/tag/v0.26.0 -->
+
+##### 💫 New Features & Changes
+
+- Introduce the new Kogito Source CRD and add support to K_SINK environment variable to Kogito services ([#1](https://github.com/knative-sandbox/eventing-kogito/pull/1))
+
+### Client v0.26
+
+<!-- Original notes are here: https://github.com/knative/client/blob/main/CHANGELOG.adoc#v0260-2021-08-10 -->
+
+#### 💫 New Features & Changes
+
+- Add `--env-file` option to function create/update command ([#1433](https://github.com/knative/client/pull/1433))
+- New CLI plugin `kn-plugin-kamelet`, a Knative CLI plugin for managing Kamelets and KameletBindings as Knative event sources. Download latest release [here](https://github.com/knative-sandbox/kn-plugin-source-kamelet/releases)
+    - List available Kamelets
+    - Describe Kamelet and print detailed information (e.g. provider, support level, properties)
+    - Bind Kamelet as source to a Knative sink (broker, channel, service)
+    - List Kamelet bindings
+    - Create Kamelet binding to bind source to Knative sink (broker, channel, service)
+- New CLI experimental functions plugin `kn-plugin-func` Download latest release [here](https://github.com/knative-sandbox/kn-plugin-func/releases)
+- New CLI experimental cloud event plugin `kn-plugin-event` Download latest release [here](https://github.com/knative-sandbox/kn-plugin-event/releases)
+#### 🧹 Clean up
+
+- Remove `DeprecatedImageDigest` field ([#1454](https://github.com/knative/client/pull/1454))
+- Reuse conflict retry loop from client-go/util/retry ([#1441](https://github.com/knative/client/pull/1441))
+
+
+## Operator v0.26
+
+<!-- Original notes are here: https://github.com/knative/operator/releases/tag/v0.26.1 -->
+
+#### 💫 New Features & Changes
+
+- Detect missing Istio requirement and suggests user to instal the Istio Gateway CRD ([#697](https://github.com/knative/operator/pull/613))
+- Adding COC, contributing doc ([#790](https://github.com/knative/operator/pull/790))
+- Remove pingsource-mt-adapter from the list of unsupported HA ([#788](https://github.com/knative/operator/pull/788))
+- Apply high-availability to all deployments managed by operator ([#749](https://github.com/knative/operator/pull/749))
+- fix misspelling of with ([#781](https://github.com/knative/operator/pull/781))
+- Add the support of spec.deployments.affinity ([#777](https://github.com/knative/operator/pull/777))
+- Adjust maxReplicas in HPA when high-availability has larger number ([#748](https://github.com/knative/operator/pull/748))
+- Prepare the Knative Operator for the label app.kubernetes.io/version ([#738](https://github.com/knative/operator/pull/738))
+- Allow to set Tolerations via spec.deployments.tolerations ([#747](https://github.com/knative/operator/pull/747))
+- Remove pingsource from HA scaling ([#740](https://github.com/knative/operator/pull/740))
+- Drop deprecated enabledComponents field setting ([#735](https://github.com/knative/operator/pull/735))
+- Use knative.dev/hack/codegen-library.sh in hack/update-codegen.sh ([#734](https://github.com/knative/operator/pull/734))
+- Remove heartbeats for eventing ([#792](https://github.com/knative/operator/pull/792))
+
+#### 🐞 Bug Fixes
+
+- Fix the error issue with installing spec.manifests ([#750](https://github.com/knative/operator/pull/750))
+
+### Thank you, contributors
+
+- [@Abirdcfly](https://github.com/Abirdcfly)
+- [@aavarghese](https://github.com/aavarghese)
+- [@aliok](https://github.com/aliok)
+- [@benmoss](https://github.com/benmoss)
+- [@devguyio](https://github.com/devguyio)
+- [@dprotaso](https://github.com/dprotaso)
+- [@dsimansk](https://github.com/dsimansk)
+- [@gabo1208](https://github.com/gabo1208)
+- [@houshengbo](https://github.com/houshengbo)
+- [@itsmurugappan](https://github.com/itsmurugappan)
+- [@julz](https://github.com/julz)
+- [@lionelvillard](https://github.com/lionelvillard)
+- [@markusthoemmes](https://github.com/markusthoemmes)
+- [@mattmoor](https://github.com/mattmoor)
+- [@matzew](https://github.com/matzew)
+- [@nak3](https://github.com/nak3)
+- [@pierDipi](https://github.com/pierDipi)
+- [@psschwei](https://github.com/psschwei)
+- [@ricardozanini](https://github.com/ricardozanini)
+- [@steven0711dong](https://github.com/steven0711dong)
+- [@travis-minke-sap](https://github.com/travis-minke-sap)
+- [@upodroid](https://github.com/upodroid)
+- [@vyasgun](https://github.com/vyasgun)
+
+### Learn more
+
+Knative is an open source project that anyone in the [community](https://knative.dev/community/) can use, improve, and enjoy. We'd love you to join us!
+
+- [Welcome to Knative](https://knative.dev/docs)
+- [Getting started documentation](https://knative.dev/docs/getting-started)
+- [Samples](https://knative.dev/docs/samples)
+- [Knative working groups](https://github.com/knative/community/blob/main/working-groups/WORKING-GROUPS.md)
+- [Knative User Mailing List](https://groups.google.com/forum/#!forum/knative-users)
+- [Knative Development Mailing List](https://groups.google.com/forum/#!forum/knative-dev)
+- Knative on Twitter [@KnativeProject](https://twitter.com/KnativeProject)
+- Knative on [StackOverflow](https://stackoverflow.com/questions/tagged/knative)
+- Knative [Slack](https://slack.knative.dev)
+- Knative on [YouTube](https://www.youtube.com/channel/UCq7cipu-A1UHOkZ9fls1N8A)