Deploy `promtail` config for `snmp_exporter`.

cookbooks/prometheus/snmp_exporter_setup.rb

@@ -25,3 +25,14 @@ end
 service 'supervisor' do
   action :nothing
 end
+
+# Deploy /etc/hosts file:
+template '/etc/promtail/snmp_exporter.yaml' do
+  owner 'root'
+  group 'root'
+  mode '644'
+
+  variables(HOSTNAME: node[:hostname], LOKIENDPOINT: node['promtail']['lokiendpoint'])
+
+  notifies :restart, 'service[promtail-prometheus]'
+end

cookbooks/prometheus/templates/etc/promtail/snmp_exporter.yaml

@@ -0,0 +1,40 @@
+server:
+  disable: true
+
+positions:
+  filename: /var/opt/promtail/promtail_snmp_exporter_position.yaml
+
+clients:
+  - url: http://<%= @LOKIENDPOINT %>/loki/api/v1/push
+
+scrape_configs:
+  - job_name: snmp_exporter
+    static_configs:
+    - targets:
+        - localhost
+      labels:
+        job: snmp_exporter
+        hostname: <%= @HOSTNAME %>
+        __path__: /var/log/supervisor/snmp_exporter.log
+
+    pipeline_stages:
+    - match:
+        selector: '{job="snmp_exporter"}'
+        stages:
+        - regex:
+            expression: '^level=(?P<level>[^ ]+) ts=(?P<timestamp>\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z) (?P<message>.+)$'
+
+        - timestamp:
+            source: timestamp
+            format: 2006-01-02T15:04:05.000Z
+            location: Etc/GMT
+
+        - template:
+            source: level
+            template: '{{ regexReplaceAllLiteral "warn" .Value "warning" }}'
+
+        - labels:
+            level:
+
+        - output:
+            source: message