Add Grafana

grafana/README.md

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+# Grafana
+
+```
+kubectl create namespace grafana
+kubectl apply -n grafana -f application.yml
+```
+
+## OIDC secret
+
+See Authelia README on provisioning and updating OIDC secrets for Grafana
+
+## Grafana post deployment steps
+
+* Configure Prometheus datasource with URL set to
+  `http://prometheus-operated.prometheus-operator.svc.cluster.local:9090`
+* Configure Elasticsearch datasource with URL set to
+  `http://elasticsearch.elastic-system.svc.cluster.local`,
+  Time field name set to `timestamp` and
+  ElasticSearch version set to `7.10+`