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* feat(annotations): add custom annotation prefix support for split horizon DNS Add --annotation-prefix flag to allow customizing the annotation prefix used by external-dns. This enables split horizon DNS scenarios where multiple instances process different sets of annotations from the same Kubernetes resources. Changes: - Add AnnotationPrefix field to Config with validation - Convert annotation constants to variables that can be reconfigured - Add SetAnnotationPrefix() function to rebuild annotation keys - Integrate annotation prefix setting in controller startup - Update Helm chart with annotationPrefix value - Add comprehensive split horizon DNS documentation - Update FAQ with annotation prefix examples This maintains full backward compatibility - the default prefix remains "external-dns.alpha.kubernetes.io/". Co-Authored-By: Claude <noreply@anthropic.com> * docs(advanced): fix markdown formatting in split-horizon guide Add blank lines before code blocks to improve markdown rendering and comply with markdownlint rules. Co-Authored-By: Claude <noreply@anthropic.com> * docs(advanced): fix markdown formatting in split-horizon guide Co-Authored-By: Claude <noreply@anthropic.com> * docs(charts): regenerate Helm chart documentation Co-Authored-By: Claude <noreply@anthropic.com> * test: add AnnotationPrefix field to test configs Add missing AnnotationPrefix field to minimalConfig and overriddenConfig test configurations to match the new default value set in NewConfig(). Co-Authored-By: Claude <noreply@anthropic.com> * test(charts): update error pattern in json-schema test Update expected error message pattern to match current Helm validation output format. Co-Authored-By: Claude <noreply@anthropic.com> * refactor(annotations): remove init() for explicit initialization - Remove init() function from annotations package - Add explicit SetAnnotationPrefix() call in controller/execute.go - Remove annotation key aliases from source/source.go - Replace all alias usages with annotations.* references (348 changes in 28 files) - Add TestMain to existing test files (service_test.go, cloudflare_test.go) This change makes annotation initialization explicit and predictable, avoiding hidden global state initialization at import time. Co-Authored-By: Claude <noreply@anthropic.com> * docs: update changelog and mkdocs to include annotationPrefix and split horizon DNS Signed-off-by: Aleksei Sviridkin <f@lex.la> * docs(split-horizon): fix linting Signed-off-by: Aleksei Sviridkin <f@lex.la> * refactor(annotations): replace hardcoded annotation prefix with constant Replace all hardcoded "external-dns.alpha.kubernetes.io/" strings with annotations.DefaultAnnotationPrefix constant to establish a single source of truth. Changes: - Add DefaultAnnotationPrefix constant in source/annotations/annotations.go - Replace hardcoded string in controller/execute.go with constant reference - Replace hardcoded strings in pkg/apis/externaldns/types.go (2 occurrences) - Add helm unit tests for annotationPrefix value This eliminates string duplication and makes future changes easier. Co-Authored-By: Claude <noreply@anthropic.com> --------- Signed-off-by: Aleksei Sviridkin <f@lex.la> Co-authored-by: Claude <noreply@anthropic.com>