Merge pull request #338 from kawych/master

Update Custom Metrics Adapter docs with more current information about metrics naming

custom-metrics-stackdriver-adapter/README.md

@@ -117,16 +117,22 @@ Metrics - Stackdriver Adapter:
    adapter exposes *rate* of the metric - the metric change per second computed
    over last 5 minutes.
 
+#### Metric names
+
+Stackdriver metrics have a form of pahths separated by "/" character, but Custom
+Metrics API forbids using "/" character. When using Custom Metrics - Stackdriver
+Adapter either directly via Custom Metrics API or by specifying a custom metric
+in HPA, replace "/" character with "|". For example, to use
+`custom.googleapis.com/my/custom/metric`, specify
+`custom.googleapis.com|my|custom|metric`.
+
 ### Export custom metrics to Stackdriver
 
 To learn how to create your custom metric and write your data to Stackdriver,
 follow [Stackdriver custom metrics documentation]. You can also follow
 [Prometheus to Stackdriver documentation] to export metrics exposed by your pods
 in Prometheus format.
 
-The name of your metric must start with custom.googleapis.com/ prefix followed
-by a simple name, as defined in [custom metric naming rules].
-
 You will report your metric against a appropriate monitored resource for Kubernetes
 objects. To use **legacy resource model**, use monitored resource `gke_container`.
 To use **new resource model**, use one of monitored resources: `k8s_pod` or