add promtail support

tasks/main.yml

@@ -56,7 +56,7 @@
       name: certificates
     vars:
       certificates:
-        certs: "{{ {}|combine(prometheus_certs, inventory_certs, recursive=True) }}"
+        certs: "{{ { 'prometheus_agent': ({}|combine(prometheus_certs, inventory_certs, recursive=True))['prometheus_agent'] } }}"
 
 - name: slurp up all scraper certs
   loop: "{{ prometheus_agent.scrapers.keys()|list }}"
@@ -123,6 +123,21 @@
     dest: /etc/prometheus/conf.d/rule_files/agent_{{ inventory_hostname }}.conf
     mode: 0644
 
+- name: handle grafana-promtail
+  when: prometheus_agent.agents.promtail.enable
+  block:
+  - name: install promtail
+    apt:
+      pkg: grafana-promtail
+  - name: wrtie promtail config
+    notify: restart grafana-promtail
+    template:
+      owner: grafana-promtail
+      group: grafana-promtail
+      mode: 0640
+      dest: /etc/grafana-promtail.yml
+      src: grafana-promtail.yml.j2
+
 - name: create node-exporter-textfile group
   ansible.builtin.group:
     name: node-exporter-textfile