Flux 1.12.0

This release renames some fluxctl commands and arguments while deprecating others, to better follow Kubernetes terminology. In particular, it drops the term "controller" in favour of "workload";
e.g., instead of

fluxctl list-controllers --controller=...

there is now

fluxctl list-workloads --workload=...

The old commands are deprecated but still available for now.

It also extends the namespace restriction flag (--k8s-allow-namespace, with a deprecated alias --k8s-namespace-whitelist) to cover all operations, including syncing; previously, it covered only query operations e.g., list-images etc..

Fixes

• Periodically refresh memcached addresses, to recover from DNS
  outages weaveworks/flux#1913
• Properly apply fluxctl policy --tag-all when a manifest does not
  have a namespace weaveworks/flux#1901
• Support newer git versions (>=2.21) weaveworks/flux#1884
• Avoid errors arising from ambiguous git refs
  weaveworks/flux#1875 and weaveworks/flux#1829
• Reload the API definitions periodically, to account for the API
  server being unavailable when starting weaveworks/flux#1859
• Admit <cluster> when parsing resource IDs, since it's now used to
  mark cluster-scoped resources weaveworks/flux#1851
• Better recognise and tolerate when Kubernetes API errors mean "not
  accessible" weaveworks/flux#1840 and weaveworks/flux#1832,
  and stop the Kubernetes client from needlessly logging them
  weaveworks/flux#1837

Improvements

• Use "workload" as the term for resources that specify pods to run,
  in fluxctl commands and wherever else it is needed
  weaveworks/flux#1777
• Make regex an alias for regexp in tag filters
  weaveworks/flux#1915
• Be more sparing when logging AWS detection failures; add flag for
  requiring AWS authentication; observe ECR restrictions on region and
  account regardless of AWS detection weaveworks/flux#1863
• Treat all *List (e.g., DeploymentList) resources as lists
  weaveworks/flux#1883
• Add host key for legacy VSTS (now Azure DevOps)
  weaveworks/flux#1870
• Extend namespace restriction to all operations, and change the name
  of the flag to --k8s-allow-namespace weaveworks/flux#1668
• Avoid updating images when there is no record for the current image
  weaveworks/flux#1831
• Include the file name in the error when kubeyaml fails to update a
  manifest weaveworks/flux#1815

Maintenance and documentation

• Avoid creating a cached image when host key verification fails while
  building weaveworks/flux#1908
• Separate "Get started" instructions for fluxd vs. fluxd with the
  Helm operator weaveworks/flux#1902, weaveworks/flux#1912
• Add an end-to-end smoke test to run in CI weaveworks/flux#1800
• Make git tracing report more output weaveworks/flux#1844
• Fix flaky API discovery test weaveworks/flux#1849

Thanks

Many thanks to @2opremio, @AmberAttebery, @alanjcastonguay,
@alexanderbuhler, @arturo-c, @benhartley, @cruisehall, @dholbach,
@dimitropoulos, @hiddeco, @hlascelles, @ipedrazas, @jrryjcksn,
@marchmallow, @mazzy89, @mulcahys, @nabadger, @pmquang,
@southbanksoftwaredeveloper, @squaremo, @srueg, @stefanprodan,
@stevenpall, @stillinbeta, @swade1987, @timfpark, @vanderstack for
contributions.