* feat: expose basic go metrics via prometheus

* chore: vendor dependencies

* feat(metrics): combine healthz and metrics into single endpoint

* ref(metrics): rename metrics port to address

* docs(metrics): update changelog to include metrics feature

* ref(metrics): consistently rename port to address

improve quality of test code

* revert changes, start a new

* remove sanitize

* fix tests for source pkg

* fix aws_tests

* add testutils to compare changes, inmemory provider allow to inspect changes

* use map instead of plan.Changes

* feat(aws): support hostnames as endpoint targets

* docs: describe how to run ExternalDNS on AWS

* docs: update changelog with CNAME feature

* docs: update changelog to include AWS documentation

* fix(aws): test that updating records removes the old value

* feat(google): add CNAME support to Google provider

* fix(source): sanitize source and target hostnames

* docs: update changelog to include latest changes

* docs(aws): mention that ExternalDNS takes full ownership of a hosted zone

* fix(aws): switch route53 tests to use endpoint pointers

* docs: add TODO to remove record filtering once ownership is in place

* add labels to endpoints

* reset to first commit fix label key

* compare using sameendpoint, add map initializer to newendpoint

* fix(endpoint): drop superflous comment indicators

* inject callbacks

* use initializer for inmemory_test to have the callbacks defined

* use pointer to endpoint via NewEndpoint initializer

* return nil if record does not exist in plan

* add test for NewEndpoint

* adjust documentation as per latest discussion regarding registry/storage

* rename group-id -> owner-id

* docs: add a CHANGELOG.md

* fix: add date to changelog

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update faq.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* docs: minor changes to the readme and faq

* create internal testutils package

* add boilerplate header to testutils/endpoint.go

* docs: elaborate the docs, add a faq section

* docs: fix a messed up command

* docs: update docs to reference v0.1 release

* docs(faq): fix stray whitespace

* docs: restructure docs for a leaner README

* docs: move first run section back to main readme

* docs: fix references to packages

* docs: fix reference to gke tutorial

* docs: fix missing source flag in examples

* docs: fix missing provider flag in examples

* docs: mention ingress support in main readme

* fix(dnsprovider): do not always initialize each DNS provider

* fix(dnsprovider): fix unnecessary error return value

* ref(dnsprovider): drop the store and use a simple switch for lookup

* docs(tutorials): add tutorial on how to use external-dns with GKE

* docs(gke): document how to setup a zone with its parent

* fix(ingress): append trailing dot to hostnames

* fix(source): update tests for sanitized DNS names