Add collector role

Sets up prometheus to pull metrics, with telegraf to process SNMP data.

roles/collector/handlers/main.yml

@@ -0,0 +1,17 @@
+- name: reload nftables
+  service:
+    name: nftables
+    state: reloaded
+  when: "'handler' not in ansible_skip_tags"
+
+- name: reload prometheus
+  service:
+    name: prometheus
+    state: reloaded
+  when: "'handler' not in ansible_skip_tags"
+
+- name: restart telegraf
+  service:
+    name: telegraf
+    state: restarted # seems to crash on reloads
+  when: "'handler' not in ansible_skip_tags"