Add observability stack with Grafana, Prometheus, Loki, and cAdvisor

- Introduced a new Grafana dashboard for monitoring Docker containers using cAdvisor.
- Created provisioning files for Grafana dashboards and data sources.
- Added Dockerfiles and configuration files for Loki and Prometheus.
- Implemented a Docker Compose stack for the observability services.
- Configured Traefik as a reverse proxy for the services with appropriate routing.
- Added scripts for SSH tunneling to access the telemetry dashboard.
- Included secrets management for Grafana admin credentials.

observability/grafana/provisioning/datasources/datasource.yml

@@ -0,0 +1,18 @@
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    uid: prometheus_uid
+    editable: false
+    isDefault: true
+    access: proxy
+    url: http://prometheus:9090
+
+  - name: Loki
+    type: loki
+    uid: loki_uid
+    editable: false
+    isDefault: false
+    access: proxy
+    url: http://loki:3100