feat: add grafana dashboard samples using GMP metrics

To be used together with Anthos clusters on VMware and on bare metal
public documentation.

CODEOWNERS

@@ -9,6 +9,7 @@
 # the Onyx GKE Observability team (go/onyx-observability)
 /aws-logging-monitoring/          @GoogleCloudPlatform/onyx-gke-observability @yoshi-approver
 /attached-logging-monitoring/     @GoogleCloudPlatform/onyx-gke-observability @yoshi-approver
+/gmp-grafana-dashboards/          @GoogleCloudPlatform/onyx-gke-observability @yoshi-approver
 /anthos-multi-cloud/		  @GoogleCloudPlatform/anthos-multicloud @yoshi-approver
 /anthos-bm-utils/		  @GoogleCloudPlatform/anthos-baremetal-eng @yoshi-approver
 /anthos-bm-apigee/		  @GoogleCloudPlatform/app-mod-customer-engineers @yoshi-approver

gmp-grafana-dashboards/README.md

@@ -0,0 +1,6 @@
+# Grafana Dashboard Samples using Google Cloud Managed Service for Prometheus
+
+
+This directory contains Grafana dashboard samples to monitor [Anthos clusters on VMware](https://cloud.google.com/anthos/clusters/docs/on-prem/latest/overview) and [Anthos clusters on bare metal](https://cloud.google.com/anthos/clusters/docs/bare-metal/latest/concepts/about-bare-metal), using metrics data from [Google Cloud Managed Service for Prometheus](https://cloud.google.com/stackdriver/docs/managed-prometheus).
+
+To use the samples in this directory, users are expected to follow [Instruction on using Managed Service for Prometheus with Anthos clusters on VMware](https://cloud.google.com/anthos/clusters/docs/on-prem/latest/how-to/logging-and-monitoring#using-managed-service-for-prometheus), or [Instruction on using Managed Service for Prometheus with Anthos clusters on bare metal](https://cloud.google.com/anthos/clusters/docs/bare-metal/latest/how-to/log-monitoring#using-managed-service-for-prometheus).