[Feature] Enable Operator Internal Metrics Exporter (#754)

Author: ajanikow

Diff for: CHANGELOG.md

@@ -1,6 +1,7 @@
 # Change Log
 
 ## [master](https://github.com/arangodb/kube-arangodb/tree/master) (N/A)
+- Enable "Operator Internal Metrics Exporter" by default
 - Enable "Operator Maintenance Management Support" by default
 - Add Operator `/api/v1/version` endpoint
 

Diff for: README.md

@@ -93,6 +93,7 @@ Feature-wise production readiness table:
 | Operator Maintenance Management Support | 1.0.7            | >= 3.5.0         | Community, Enterprise | Alpha      | False   | --deployment.feature.maintenance           | N/A                                                                      |
 | Operator Maintenance Management Support | 1.2.0            | >= 3.5.0         | Community, Enterprise | Production | True    | --deployment.feature.maintenance           | N/A                                                                      |
 | Operator Internal Metrics Exporter      | 1.1.9            | >= 3.6.0         | Community, Enterprise | Alpha      | False   | --deployment.feature.metrics-exporter      | N/A                                                                      |
+| Operator Internal Metrics Exporter      | 1.2.0            | >= 3.6.0         | Community, Enterprise | Production | True    | --deployment.feature.metrics-exporter      | N/A                                                                      |
 
 ## Release notes for 0.3.16
 

Diff for: pkg/deployment/features/metrics.go

@@ -31,7 +31,7 @@ var metricsExporter = &feature{
 	description:        "Define if internal metrics-exporter should be used",
 	version:            "3.6.0",
 	enterpriseRequired: false,
-	enabledByDefault:   false,
+	enabledByDefault:   true,
 }
 
 func MetricsExporter() Feature {