Main #60: Addition of OpenSlice Observability Dashboard and readme

# Openslice Pod Metrics and Logs Dashboard (Grafana)

A dashboard to visualize Kubernetes pod metrics and logs.

## Prerequisites

- **Grafana**  

  A running Grafana instance (v7.0+ recommended).  

- **Prometheus data source**  

  - Must be added in Grafana and scraping your cluster’s metrics (e.g. via kube-prometheus or another Prometheus setup).  

- **Loki data source** 

  - Must be added in Grafana to include pod logs alongside metrics.  

- **Kubernetes metrics exposure**  

  - Metrics-server or Prometheus exporters installed so that Prometheus can scrape pod-level metrics.  

## Import Dashboard from JSON

1. In your Grafana UI, click **“Import”**.  

2. Under **“Upload JSON file”**, select  

   `kubernetes/helm/observability/openslice_observability_dashboard.json`.  

3. Choose your **Prometheus** data source.  

4. Choose your **Loki** data source.  

5. Click **“Import”**.

6. In the **“namespace”** variable dropdown, select `openslice`.