Merge branch '169-alertes-pour-les-certificats-se-declenchent-trop-tot' into 'main'

Resolve "Alertes pour les certificats se déclenchent trop tôt"

Closes #169

See merge request !192

roles/alertmanager/templates/rules/base.rules.j2

@@ -85,7 +85,7 @@ groups:
     rules:
       - alert: Certificate Expires Next Month
         for: 5m
-        expr: x509_cert_expiry{organization=""} / 86400 < 30
+        expr: round(x509_cert_expiry{organization=""} / 86400) < 30
         labels:
           severity: critical
           frequency: daily