add new option to helm chart

Author: malpou

charts/external-dns/templates/deployment.yaml

@@ -106,6 +106,9 @@ spec:
             {{- if and (eq .Values.txtPrefix "") (ne .Values.txtSuffix "") }}
             - --txt-suffix={{ .Values.txtSuffix }}
             {{- end }}
+            {{- if .Values.txtNewFormatOnly}}
+            - --txt-new-format-only
+            {{- end }}
             {{- if .Values.namespaced }}
             - --namespace={{ .Release.Namespace }}
             {{- end }}

charts/external-dns/values.yaml

@@ -222,6 +222,11 @@ txtPrefix:
 # -- (string) Specify a suffix for the domain names of TXT records created for the `txt` registry.
 # Mutually exclusive with `txtPrefix`.
 txtSuffix:
+# -- (boolean) When true, creates TXT records only in the new format that includes record type information (e.g. "a-" prefix for A records).
+# This reduces the number of DNS records created, helping with provider-specific record limits.
+# Note: All ExternalDNS instances must support the new format before enabling this option.
+# Default: false (maintains backwards compatibility by creating both old and new format records)
+txtNewFormatOnly: false
 
 # -- Limit possible target zones by domain suffixes.
 domainFilters: []