Changes:
- Remove path-base transform that was stripping metric names to just leaf elements
- Change VXLAN subscription from on_change to sample mode (30s interval)
to ensure consistent metric collection
- Remove unused event-processors from Prometheus output
- Clean up processor configuration
This fixes metric naming to match Grafana dashboard expectations:
- Before: gnmic_interfaces_out_octets
- After: gnmic_interfaces_interface_state_counters_out_octets
The full path names provide better clarity and match standard OpenConfig
metric naming conventions used in dashboards.