notes for getting v0.4 metrics running (#128)

docs/guides/v0.4_metrics_config.md

@@ -0,0 +1,29 @@
+# v0.4 Metrics Configuration
+
+This requires a version of OpenZiti with a `fabric` dependency of `v0.22.52` or newer.
+
+## controller configuration:
+
+```
+network:
+  intervalAgeThreshold: 5s 
+  metricsReportInterval: 5s
+
+events:
+  jsonLogger:
+    subscriptions:
+      - type: fabric.usage
+        version: 3
+    handler:
+      type: file
+      format: json
+      path: /tmp/fabric-usage.log
+```
+
+## router configuration:
+
+```
+metrics:
+  reportInterval: 5s
+  intervalAgeThreshold: 5s
+```