feat: add icmp probing (ping) (#97)

* feat: add icmp probing (ping)
* feat: ping proxy1 and proxy2

configs/blackbox_exporter/config.yml

@@ -31,6 +31,11 @@ modules:
         insecure_skip_verify: false
       preferred_ip_protocol: "ip4" # defaults to "ip6"
       ip_protocol_fallback: false  # no fallback to "ip6"
+  icmp:  # aka ping
+    prober: icmp
+    timeout: 5s
+    icmp:
+      preferred_ip_protocol: "ip4"
   # http_post_2xx:
   #   prober: http
   #   timeout: 5s

configs/prometheus/config.yml

@@ -155,3 +155,30 @@ scrape_configs:
           - elasticsearch|http://10.1.0.203:9200/_cluster/health?wait_for_status=yellow&timeout=50s
         labels:
           env: org
+  - job_name: blackbox-exporter-icmp
+    metrics_path: /probe
+    scrape_interval: 60s
+    params:
+      module: [icmp_probe]
+    relabel_configs:
+      - source_labels: [__address__]
+        regex: ^([^|]+)\|(.+)$ # splits target by | and uses 2nd token as target for blackbox_exporter
+        replacement: ${2}
+        target_label: __param_target
+      - source_labels: [__address__]
+        regex: (.+)\|(.+) # splits target by | and uses 1st token as 'app' label
+        replacement: ${1}
+        target_label: app
+      - source_labels: [__param_target]
+        target_label: instance
+      - replacement: blackbox_exporter:9115
+        target_label: __address__
+    static_configs:
+      - targets:
+          - ovh1:ovh1.openfoodfacts.org
+          - proxy1_ovh:proxy1.openfoodfacts.org
+          - proxy2_free:proxy2.openfoodfacts.org
+          - ovh2:ovh2.openfoodfacts.org
+          - ovh3:ovh3.openfoodfacts.org
+          - off1:off1.openfoodfacts.org
+          - off2:off2.openfoodfacts.org