Expand on Kube Metrics Adaptor implementation

staging/src/k8s.io/metrics/IMPLEMENTATIONS.md

@@ -29,4 +29,6 @@ They are listed here for convenience.***
   Implementation of the external metrics provider, using Datadog as a backend for the metrics.
   Coming soon: Implementation of the custom metrics provider to support in-cluster metrics collected by the Datadog Agents.
 
-- [Kube Metrics Adapter](https://github.com/zalando-incubator/kube-metrics-adapter). A general purpose metrics adapter for Kubernetes that can collect and serve custom and external metrics for Horizontal Pod Autoscaling.
+- [Kube Metrics Adapter](https://github.com/zalando-incubator/kube-metrics-adapter). A general purpose metrics adapter for Kubernetes that can collect and serve custom and external metrics for Horizontal Pod Autoscaling.
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+  Provides the ability to scrape pods directly or from Prometheus through user defined queries.
+  Also capable of serving external metrics from a number of sources including AWS' SQS and [ZMON monitoring](https://github.com/zalando/zmon).
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