fix(annotations): require --annotation-prefix to be set explicitly to prevent silent DNS record deletion

Signed-off-by: ivan katliarchuk <ivan.katliarchuk@gmail.com>

Author: ivankatliarchuk

docs/flags.md

@@ -20,7 +20,7 @@ tags:
 | `--skipper-routegroup-groupversion="zalando.org/v1"`               | The resource version for skipper routegroup                                                                                                                                                                                                                                                                                                                                                                                                                                            |
 | `--[no-]always-publish-not-ready-addresses`                        | Always publish also not ready addresses for headless services (optional)                                                                                                                                                                                                                                                                                                                                                                                                               |
 | `--annotation-filter=""`                                           | Filter resources queried for endpoints by annotation, using label selector semantics                                                                                                                                                                                                                                                                                                                                                                                                   |
-| `--annotation-prefix="external-dns.kubernetes.io/"`                | Annotation prefix for external-dns annotations (default: external-dns.kubernetes.io/)                                                                                                                                                                                                                                                                                                                                                                                                  |
+| `--annotation-prefix=""`                                           | Annotation prefix for external-dns annotations (default: external-dns.kubernetes.io/)                                                                                                                                                                                                                                                                                                                                                                                                  |
 | `--compatibility=`                                                 | Process annotation semantics from legacy implementations (optional, options: mate, molecule, kops-dns-controller)                                                                                                                                                                                                                                                                                                                                                                      |
 | `--connector-source-server="localhost:8080"`                       | The server to connect for connector source, valid only when using connector source                                                                                                                                                                                                                                                                                                                                                                                                     |
 | `--crd-source-apiversion="externaldns.k8s.io/v1alpha1"`            | API version of the CRD for crd source, e.g. `externaldns.k8s.io/v1alpha1`, valid only when using crd source                                                                                                                                                                                                                                                                                                                                                                            |