edge-21.11.3

This edge releases fixes a compatibility issue that prevented the policy
controller from starting in some Kubernetes distributions. This release also
includes a new High Availability mode for the gateway component in multicluster
extension. Various dependencies across the CNI plugin, Policy Controller and
dashboard have also been upgraded. In the proxy, error logging when the proxy
fails to accept a connection due to a system error has been improved.

• Updated policy controller to use openssl instead of rustls to fix
  compatibility issues with some Kubernetes distributions
• Added HA mode to multicluster gateway that adds a PodDisruptionBudget,
  additional replicas and anti-affinity to the deployment (thanks @Crevil)
• Improved TCP server error messages in the proxy
• Fixed broken Grafana links in the dashboard
• Upgraded CNI pkg to v0.8.1 in linkerd-cni to support latest CNI
  versions
• Updated various dependencies in the dashboard, policy controller
  (thanks @dependabot)

edge-21.11.2

This edge release introduces a new Services page in the web dashboard that shows
live calls and route metrics for meshed services. Additionally, the proxy-init
container is no longer enforced to run as root. Lastly, the proxy can now retry
requests with a content-length header—permitting requests emitted by grpc-go
to be retried.

• Removed hardcoding that enforced the proxy-init container to run as root
  (thanks @chrischdi!)
• Added support for retrying requests without a content-length header
• Changed service discovery logs from TRACE to DEBUG
• Fixed issue with policy controller where it assumed linkerd was the name of
  the control plane namespace, leading to issues with installations that use a
  non-default namespace name
• Added support for ephemeral storage requests and limits configured either
  through the CLI or annotations (thanks @michaellzc!)
• Deprecated support for topology keys and added support for topology aware
  hints
• Added logFormat and logLevel configuration values for the proxy-init
  container (thanks @gusfcarvalho!)
• Added services to the web dashboard (thanks @krzysztofdrys!)
• Updated example commands in the web dashboard to use the viz subcommand when
  necessary (thanks @mikutas!)
• Removed references to linkerd-sp-validator service account in the
  linkerd-psp role binding (thanks @multimac!)

edge-21.11.1

In this edge, we're very excited to introduce Service Account Token Volume
Projections, used to set up the pods' identities. These tokens are bounded
specifically for this use case and are rotated daily, replacing the usage of the
default tokens injected by Kubernetes which are overly permissive.

Note that this edge release updates the minimum supported kubernetes version to 1.20.

• Updated the minimum supported kubernetes version to 1.20
• Use Service Account Token Volume Projections to set up the pods' identities;
  now injection also works on pods with automountServiceAccountToken set to
  false
• Updated proxy-init's Alpine base image to fix some CVEs (not affecting
  Linkerd)
• Updated the Prometheus image in linkerd-viz to 2.30.3
• Changed the proxy and policy controller to use jemalloc on x86_64 gnu/linux to
  reduce memory usage
• Fixed output for linkerd check -o json
• Added ability to configure ephemeral-storage resources for each component
  (thanks @michaellzc!)

stable-2.11.1

BEFORE YOU DOWNLOAD THIS RELEASE: Please take 60 seconds to tell the CNCF that you are using Linkerd. This is hugely important for the project, will only take a minute, and we need your voice! https://www.surveymonkey.com/r/LZJ9DD7

This release relaxes the policy on the identity controller, allowing it to work
in more environments. It updates the CLI and Helm charts to indicate that the
minimum supported Kubernetes version is 1.17.0. It also fixes a number of bugs
in the CLI, multicluster extension, and proxy.

• Fixed incorrect opaque ports warning in linkerd check --proxy with un-named
  ports
• Updated linkerd check to avoid multiline errors with retryable checks
• Fixed multicluster gateway name for ServerAuthorization
• Removed unused crtExpiry template parameter from helm charts
• Updated minimum kubernetes version to 1.17.0
• Moved service mirror policy into multicluster base chart
• Added an -o short command-line flag for extension check commands
• Skipped Prometheus scrapes on policy's admin server so that it no longer
  incorrectly appears as "DOWN" in the Prometheus UI
• Updated the identity controller to use the 'all-unauthenticated' policy so
  that it can accept health checks from the node IPs
• Fixed a bug where authz CLI commands would fail when policy resources had an
  empty selector
• Fixed an infinite loop in the proxy that could cause it to be killed
• Fixed a bug where extension checks were rendered in the wrong format
• Changed the policy-controller to use jemalloc on x86_64 gnu/linux to reduce
  memory usage

edge-21.10.3

This edge release fixes a bug in the proxy that could cause it to be killed in
certain situations. It also uses a more relaxed policy for the identity
controller that allows it to work in environments where health checks come from
outside of the pod network.

• Skipped Prometheus scrapes on policy's admin server so that it no longer
  incorrectly appears as "DOWN" in the Prometheus UI
• Updated the identity controller to use the 'all-unauthenticated' policy so
  that it can accept health checks from the node IPs
• Fixed an infinite loop in the proxy that could cause it to be killed
• Added tests for the multicluster install command (thanks @Crevil!)
• Fixed a bug where authz CLI commands would fail when policy resources had
  an empty selector

edge-21.10.2

This edge release fixes linkerd check and the helm charts to explicitly
indicate that the minimum Kubernetes version is 1.17.0. Prior to this change,
there was no validation or enforcement from linkerd check or helm to meet this
minimum requirement.

This edge also improves check functionality for extensions by adding the
-oshort flag, and prevents duplicate policy resources from being created for
linked multicluster services.

• Moved service mirror policy into multicluster base chart
• Added -oshort flag for extension check commands
• Updated minimum kubernetes version to 1.17.0
• Removed unused crtExpiry template parameter from helm charts
• Fixed multicluster gateway name for ServerAuthorization
• Added priorityClassName to the helm charts to configure control plane
  components

edge-21.10.1

This release includes some fixes in the linkerd check, along with a
bunch of dependency updates across the dashboard, Go components, and
others. On the proxy side, Support for TLSv1.2 has been dropped
(Only TLSv1.3 cipher suite will be used), h2 crate has been updated
to support HTTP/2 messages with larger header values.

• Updated linkerd check to avoid multiline errors with retryable checks
• Fixed incorrect opaque ports warning in linkerd check --proxy with
  un-named ports
• Bumped proxy-init to 1.4.1 which adds support for --log-level
  and --log-format flags (thanks @gusfcarvalho)
• Removed the use of TLSv1.2 in the proxy
• Updated the h2 crate in the proxy to support HTTP/2 messages with
  larger header values.
• Updated various dependencies across the dashboard, policy-controller, etc
  (thanks @dependabot!)

stable-2.11.0

This release introduces access control policies. Default policies may be
configured at the cluster- and workspace-levels; and fine grained policies may
be instrumented via the new policy.linkerd.io/v1beta1 CRDs: Server and
ServerAuthorization. These resources may be created to define how individual
ports accept connections; and the Server resource will be a building block for
future features that configure inbound proxy behavior.

Furthermore, ServiceProfile retry configurations can now instrument retries
for requests with bodies. This unlocks retry behavior for gRPC services.

Upgrade notes: Please see the upgrade instructions.

• Proxy

  • Reduced CPU & Memory usage by up to 30% in some load tests
  • Updated retries to support requests with bodies up to 64KB. ServiceProfiles
    may now configure retries for gRPC services
  • The proxy's container image is now based on gcr.io/distroless/cc to
    contain a minimal OS footprint that should not trigger unnecessary alerts in
    security scanners
  • Added the inbound_http_errors_total and outbound_http_errors_total
    metrics to reflect errors that caused the proxy to respond with errors
  • Added an l5d-proxy-error header that is included on responses on trusted
    connections for debugging purposes
  • Added a l5d-client-id header on mutually-authenticated inbound requests so
    that applications can discover the client's identity
  • Added metrics to reflect TCP and HTTP authorization decisions
  • Added srv_name and saz_name labels to inbound HTTP metrics
  • Fixed an issue that could cause the proxy to continually reconnect to
    defunct service endpoints
  • Dropped support for non-HTTP outbound services when linkerd.io/inject: ingress is used
  • Instrumented fuzz testing to help guard against unexpected panics

• Control Plane

  • Added a new policy-controller container to the linkerd-destination
    pod--the first control plane component implemented in Rust
  • Added a new admission controller to validate that multiple Server
    resources do not reference the same port
  • Added a linkerd-identity-trust-roots ConfigMap which configures the trust
    root bundle for all pods in the core control plane namespace
  • Eliminated the linkerd-controller deployment so that Linkerd's core
    control plane now consists of only 3 deployments
  • Updated the proxy injector to configure the proxy-init container with
    NET_RAW and NET_ADMIN capabilities so that the container does not fail
    when the pod drops these capabilities

• CLI

  • Enhanced linkerd completion to expand Kubernetes resources from the current
    kubectl context
  • Added an authz subcommand to display the authorization policies that
    impact a workload
  • Added a short output mode for linkerd check that only prints failed
    checks
  • Added support for ReplicaSets to linkerd stat so that pods created by
    Argo Rollout resources can be inspected

• Helm: please see the upgrade instructions.

• Extensions:

  • Introduced a new (optional) SMI extension responsible for reading
    specs.smi-spec.io resources and converting them to Linkerd resources

  • In stable-2.12, this extension will be required to use TrafficSplit
    resources with Linkerd

  • Added an extensions page to the Linkerd Web UI

  • Viz

    • Added Server and ServerAuthorization resources for all ports
    • Added JSON log formatting

  • Jaeger

    • Added OpenTelemetry collector instead of OpenCensus

  • Multicluster

    • Added experimental support for StatefulSet workloads

This release includes changes from a massive list of contributors. A special
thank-you to everyone who helped make this release possible:

Gustavo Fernandes de Carvalho @gusfcarvalho
Oleg Vorobev @olegy2008
Bart Peeters @bartpeeters
Stepan Rabotkin @EpicStep
LiuDui @xichengliudui
Andrew Hemming @drewhemm
Ujjwal Goyal @importhuman
Knut Götz @knutgoetz
Sanni Michael @sannimichaelse
Brandon Sorgdrager @bsord
Gerald Pape @ubergesundheit
Alexey Kostin @rumanzo
rdileep13 @rdileep13
Takumi Sue @mikutas
Akshit Grover @akshitgrover
Sanskar Jaiswal @aryan9600
Aleksandr Tarasov @aatarasoff
Taylor @SkinN
Miguel Ángel Pastor Olivar @migue
wangchenglong01 @wangchenglong01
Josh Soref @jsoref
Carol Chen @kipply
Peter Smit @psmit
Tarvi Pillessaar @tarvip
James Roper @jroper
Dominik Münch @muenchdo
Szymon Gibała @Szymongib
Mitch Hulscher @mhulscher

edge-21.9.5

This edge is a release candidate for stable-2.11.0, containing a couple of
improvements to linkerd check, some final tweaks before the stable release,
and a couple of contributions from the community.

• Had linkerd check --proxy stop failing on pods that are in Shutdown status
  (thanks @olegy2008!)
• Lowered from error to warning a failed check on misconfigured opaque ports
  annotations, given that doesn't imply the installation is broken
• Added log level and format settings to all the viz components (thanks
  @gusfcarvalho!)
• Removed label from the multicluster gateway and service-mirror pods to allow
  them to be properly rolled out when upgrading

edge-21.9.4

This edge is a release candidate for stable-2.11.0! It introduces a new
linkerd viz auth command which shows metrics for server authorizations broken
down by server for a given resource. It also shows the rate of unauthorized
requests to each server. This is helpful for seeing a breakdown of which
authorizations are being used and what proportion of traffic is being rejected.

It also fixes an issue in the proxy where HTTP load balancers could continue
trying to establish connections to endpoints that were removed from service
discovery. In addition it improves the proxy's error handling so that it can
signal to an inbound proxy when its peers outbound connections should be torn
down.

• Changed destination watch updates from info to debug to reduce the amount
  of logs (thanks @bartpeeters!)
• Added the linkerd viz auth command which shows metrics for server
  authorizations broken down by server for a given resource
• Fixed an issue where the policy controller's validating admission webhook
  attempted to validate ServerAuthorizations when it should only be validating
  Servers
• Removed omitWebhookSideEffects setting now that we no longer support
  Kubernetes 1.12
• Improved proxy error handling so that it can signal to its peers that their
  outbound connections should be torn down
• Fixed an issue where after upgrades there would be a mismatch in certs used by
  the policy controller validator; the destination pod is now restarted similar
  to the injector
• Fixed a field reference in the Helm template to properly refer to
  profileValidator.namespaceSelector
• Updated policy CRD versions to v1beta1
• Added support for stat's -o json option to Server resources
• Fixed an issue in the proxy where HTTP load balancers could continue trying to
  establish connections to endpoints that were removed from service discovery
• Added JSON output format to linkerd viz authz command