feat(metrics): Add metrics for domain expiration (#1244)

* Add metrics for domain expiration

* Update grafana and prometheus versions and extend grafana dashboard with Domain expiration

* feat(deps) update whois version

---------

Co-authored-by: TwiN <[email protected]>

Author: StefanBalea

.examples/docker-compose-grafana-prometheus/config/config.yaml

@@ -16,4 +16,10 @@ endpoints:
     url: https://api.github.com/healthz
     interval: 5m
     conditions:
-      - "[STATUS] == 200"
+      - "[STATUS] == 200"
+
+  - name: check-domain-expiration
+    url: "https://example.org/"
+    interval: 1h
+    conditions:
+      - "[DOMAIN_EXPIRATION] > 720h"

.examples/docker-compose-grafana-prometheus/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.9"
 services:
   gatus:
     container_name: gatus
@@ -13,7 +12,7 @@ services:
 
   prometheus:
     container_name: prometheus
-    image: prom/prometheus:v2.14.0
+    image: prom/prometheus:v3.5.0
     restart: always
     command: --config.file=/etc/prometheus/prometheus.yml
     ports:
@@ -25,7 +24,7 @@ services:
 
   grafana:
     container_name: grafana
-    image: grafana/grafana:6.4.4
+    image: grafana/grafana:12.1.0
     restart: always
     environment:
       GF_SECURITY_ADMIN_PASSWORD: secret