stable-2.1.0

Announcing Linkerd 2.1 🎈

This stable release introduces several major improvements, including per-route
metrics, service profiles, and a vastly improved dashboard UI. It also adds
several significant experimental features, including proxy auto-injection,
single namespace installs, and a high-availability mode for the control plane.

For more details, see the announcement blog post:
https://blog.linkerd.io/2018/12/06/announcing-linkerd-2-1/

To install this release, run: curl https://run.linkerd.io/install | sh

Upgrade notes: The control plane components have been renamed in this
release to reduce possible naming collisions. Please make sure to read the
upgrade instructions if you are upgrading from the stable-2.0.0 release.

Special thanks to: @alenkacz, @alpeb, @benjdlambert, @fahrradflucht,
@ffd2subroutine, @hypnoglow, @ihcsim, @lucab, and @rochacon.

Full release notes:

• CLI
  • linkerd routes command displays per-route stats for any resource
  • Service profiles are now supported for external authorities
  • linkerd profile --open-api flag generates a service profile
    based on an OpenAPI specification (swagger) file
  • linkerd routes command displays per-route stats for services with
    service profiles
  • Add --ha flag to linkerd install command, for HA
    deployment of the control plane
  • Update stat command to accept multiple stat targets
  • Fix authority stat filtering when the --from flag is present
  • Various improvements to check command, including:
    • Emit warnings instead of errors when not running the latest version
    • Add retries if control plane health check fails initially
    • Run all pre-install RBAC checks, instead of stopping at first failure
  • Fixed an issue with the --registry install flag not accepting
    hosts with ports
  • Added an --output stat flag, for printing stats as JSON
  • Updated the top table to set column widths dynamically
  • Added a --single-namespace install flag for installing
    the control plane with Role permissions instead of ClusterRole permissions
  • Added a --proxy-auto-inject flag to the install command,
    allowing for auto-injection of sidecar containers
  • Added --proxy-cpu and --proxy-memory flags to the install
    and inject commands, giving the ability to configure CPU + Memory requests
  • Added a --context flag to specify the context to use to talk
    to the Kubernetes apiserver
  • The namespace in which Linkerd is installed is configurable via the
    LINKERD_NAMESPACE env var, in addition to the --linkerd-namespace flag
  • The wait time for the check and dashboard commands is
    configurable via the --wait flag
  • The top command now aggregates by HTTP method as well
• Controller
  • Rename snake case fields to camel case in service profile spec
  • Controller components are now prefixed with linkerd- to
    prevent name collisions with existing resources
  • linkerd install --disable-h2-upgrade flag has been added to
    control automatic HTTP/2 upgrading
  • Fix auto injection issue on Kubernetes v1.9.11 that would
    merge, rather than append, the proxy container into the application
  • Fixed a few issues with auto injection via the proxy-injector webhook:
    • Injected pods now execute the linkerd-init container last, to avoid
      rerouting requests during pod init
    • Original pod labels and annotations are preserved when auto-injecting
  • CLI health check now uses unified endpoint for data plane checks
  • Include Licence files in all Docker images
• Proxy
  • The proxy's tap subsystem has been reimplemented to be more
    efficient and and reliable
    • The proxy now supports route metadata in tap queries and events
  • A potential HTTP/2 window starvation bug has been fixed
  • Prometheus counters now wrap properly for values greater than 2^53
  • Add controller client metrics, scoped under control_
  • Canonicalize outbound names via DNS for inbound profiles
  • Fix routing issue when a pod makes a request to itself
  • Only include classification label on response_total metric
  • Remove panic when failing to get remote address
  • Better logging in TCP connect error messages
• Web UI
  • Top routes page, served at /routes
  • Route metrics are now available in the resource detail pages for
    services with configured profiles
  • Service profiles can be created and downloaded from the Web UI
  • Top Routes page, served at /routes
  • Fixed a smattering of small UI issues
  • Added a new Grafana dashboard for authorities
  • Revamped look and feel of the Linkerd dashboard by switching
    component libraries from antd to material-ui
  • Added a Help section in the sidebar containing useful links
  • Tap and Top pages
    • Added clear button to query form
  • Resource Detail pages
    • Limit number of resources shown in the graph
  • Resource Detail page
    • Better rendering of the dependency graph at the top of the page
    • Unmeshed sources are now populated in the Inbound traffic table
    • Sources and destinations are aligned in the popover
  • Tap and Top pages
    • Additional validation and polish for the form controls
    • The top table clears older results when a new top call is started
    • The top table now aggregates by HTTP method as well