feat: use parser to load dynamic config from file.

docs/content/migration/v2.md

@@ -302,3 +302,9 @@ providers:
 --entryPoints.websecure.address=:443
 --providers.kubernetesIngress=true
 ```
+
+## v2.2 to v2.3
+
+### File Provider
+
+The file parser has been changed, since v2.3 the unknown options/fields in a dynamic configuration file are treated as errors.

docs/content/providers/file.md

@@ -238,7 +238,7 @@ Thus, it's possible to define easily lot of routers, services and TLS certificat
     [[tls.certificates]]
       certFile = "/etc/traefik/cert-{{ $e }}.pem"
       keyFile = "/etc/traefik/cert-{{ $e }}.key"
-      store = ["my-store-foo-{{ $e }}", "my-store-bar-{{ $e }}"]
+      stores = ["my-store-foo-{{ $e }}", "my-store-bar-{{ $e }}"]
     {{ end }}
     
     [tls.config]