add unbound-exporter setup tasks and some docs

deploy.yaml

@@ -59,6 +59,19 @@
       loop:
         - local-data.conf
         - noc.conf
+
+    # Unbound exporter installed with go as the unbound_exporter user using:
+    # go install github.com/letsencrypt/unbound_exporter@latest
+    # to /home/unbound_exporter/go/unbound_exporter
+    - name: deploy unbound exporter service
+      ansible.builtin.copy:
+        src: "resources/resolv-dns/files/unbound-exporter.service"
+        dest: "/etc/systemd/system/unbound-exporter.service"
+        owner: root
+        group: root
+        mode: "0644"
+      become: true
+      notify: Restart Unbound exporter service
       
   handlers:
     - name: Restart Unbound
@@ -66,3 +79,10 @@
         name: unbound
         state: restarted
       become: true
+
+    - name: Restart Unbound exporter service
+      ansible.builtin.systemd_service:
+        name: unbound-exporter
+        state: restarted
+        daemon_reload: true
+      become: true