Do not consider "dynamic relabeling" as experimental any more (#150)

* Remove test for experimental feature

* Adjust README

README.adoc

@@ -447,14 +447,6 @@ namespace "test" {
 
 Have a look at http://nginx.org/en/docs/syslog.html[the respective section of the NGINX documentation] on how to set up NGINX to log into syslog.
 
-Experimental features
----------------------
-
-The exporter contains features that are currently experimental and may change without prior notice.
-To use these features, either set the `-enable-experimental` flag or add a `enable_experimental`
-option to your configuration file (on the root of the configuration file document, like
-`enable_experimental: true` in YAML or `enable_experimental = true` in HCL).
-
 ### Dynamic re-labeling
 
 Re-labeling lets you add arbitrary fields from the parsed log line as labels to your metrics.

config/struct_namespace.go

@@ -46,10 +46,6 @@ type SyslogSource struct {
 // StabilityWarnings tests if the NamespaceConfig uses any configuration settings
 // that are not yet declared "stable"
 func (c *NamespaceConfig) StabilityWarnings() error {
-	if len(c.RelabelConfigs) > 0 {
-		return errors.New("you are using the 'relabel' configuration parameter")
-	}
-
 	return nil
 }