Kuma: Configure per-device interval

ansible/group_vars/all/kuma.yaml

@@ -0,0 +1,2 @@
+---
+heartbeat_timer_interval: 300

ansible/host_vars/thonkpad.ka.chaoswg.org/override.yaml

@@ -0,0 +1,2 @@
+---
+heartbeat_timer_interval: 60

ansible/plays/common.yaml

@@ -246,7 +246,7 @@
         name: "{{ inventory_hostname }}"
         description: "Managed by Ansible"
         type: push
-        interval: 330
+        interval: "{{ heartbeat_timer_interval|mandatory + 30 }}"
         maxretries: 2
         notification_names:
           - "Kuma Statusmonitor"

ansible/plays/templates/heartbeat.timer.j2

@@ -1,9 +1,9 @@
 [Unit]
-Description=Send heartbeat every 5 minutes
+Description=Notify Kuma that this node is alive
 
 [Timer]
-OnCalendar=*-*-* *:00/5:00
+OnActiveSec={{ heartbeat_timer_interval }}
-Persistent=true
+OnUnitActiveSec={{ heartbeat_timer_interval }}
 
 [Install]
 WantedBy=timers.target