Grafana dashboard: RARE/freeRouter - BGP peer learned / advertised
Description: Display BGP peer learned and advertised prefix metrics

`scope:local` to freeRouter node

freeRouter Prometheus configuration: (copy & paste in freeRouter CLI)
* Create hardware and software sensor
```
sensor bgp4peer
 path bgp4/peer/peer
 prefix freertr-bgp4peer
 prepend bgp4_peer_
 command sho ipv4 bgp 1 summ
 name 0 peer=
 key name bgp4/peer
 replace \. _
 column 2 name state
 column 2 replace false 0
 column 2 replace true 1
 column 3 name learn
 column 4 name advert
 exit
sensor bgp4perf
 path bgp4/perf/perf
 prefix freertr-bgp4perf
 prepend bgp4_perf_
 command sho ipv4 bgp 1 best | exc last
 key name bgp4/perf
 replace \s _
 column 1 name val
 exit
sensor bgp6peer
 path bgp6/peer/peer
 prefix freertr-bgp6peer
 prepend bgp6_peer_
 command sho ipv6 bgp 1 summ
 name 0 peer=
 key name bgp6/peer
 replace \: _
 column 2 name state
 column 2 replace false 0
 column 2 replace true 1
 column 3 name advert
 exit
sensor bgp6perf
 path bgp6/perf/perf
 prefix freertr-bgp6perf
 prepend bgp6_perf_
 command sho ipv6 bgp 1 best | exc last
 key name bgp6/perf
 replace \s _      
 column 1 name val
 exit
```
* freeRtr server Prometheus agent configuration

```
server prometheus pr
 sensor bgp4peer
 sensor bgp4perf
 sensor bgp6peer
 sensor bgp6perf
 vrf <PROMETHEUS_VRF>
 exit
```
* Prometheus server configuration (sample config with 2 nodes)
```
global:
  scrape_interval: 15s
  scrape_timeout: 10s
  evaluation_interval: 30s
alerting:
  alertmanagers:
  - static_configs:
    - targets: []
    scheme: http
    timeout: 10s
scrape_configs:
- job_name: router
  scrape_interval: 15s
  scrape_timeout: 10s
  metrics_path: /metrics
  scheme: http
  static_configs:
  - targets:
    - <prometheus_agent_ip_1>:9001
    labels:
      node_name: <prometheus_agent_1_node_name>
  - targets:
    - <prometheus_agent_ip_2>:9001
    labels:
      node_name: <prometheus_agent_2_node_name>
```


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