Add Initial Pipeline Serivce Dashboard

A Grafana dashboard will make it easy for operators to monitor Pipeline
Service components at a glance. The dashboard definitions here can be
deployed using Kustomize on a cluster with the Grafana operator
installed.

This contains an initial dashboard definition, with the intent that
future contributors can add additional graphs and charts. The dashboard
consists of the following:

- Line graphs of completed TaskRuns and PipelineRuns, expressed as a
  rate per hour.
- A success gauge measuring the percent of successful TaskRuns and
  PipelineRuns.

The dashboard assumes that Prometheus will be used as the data source,
and that the following metrics are recorded and exported via a
ServiceMonitor:

- `tekton_pipelines_controller_pipelinerun_count`
- `tekton_pipelines_controller_taskrun_count`

Author: adambkaplan

operator/gitops/README.md

@@ -10,4 +10,14 @@ We want to make the onboarding experience to use Pipeline Service as easy and cu
 
 Before installing the prerequisites, refer [DEPENDENCIES.md](../../DEPENDENCIES.md) to verify the versions of products, operators and tools used in Pipeline Service.
 
-## TODO
+## Components
+
+Pipeline Service is composed of the following components, which can be deployed via `kustomize` or referenced in an ArgoCD application:
+
+- `pipeline-service` - the core components that make up the service. Deploys the following:
+  - OpenShift Pipelines operator
+  - Pipelines as Code
+  - Tekton Chains
+  - Tekton Results
+  - Tekton Metrics Exporter
+- `grafana` - optional Grafana dashboard for monitoring.

operator/gitops/argocd/grafana/dashboard.yaml

@@ -0,0 +1,11 @@
+---
+apiVersion: integreatly.org/v1alpha1
+kind: GrafanaDashboard
+metadata:
+  name: grafana-dashboard-pipeline-service
+  labels:
+    app: appstudio-grafana
+spec:
+  configMapRef:
+    name: grafana-dashboard-pipeline-service
+    key: pipeline-service-dashboard.json