add memcached exporter - first draft

templates/conf/prometheus.yml.j2

@@ -321,3 +321,20 @@ scrape_configs:
         - {{ target }}
 {% endfor %}
 {% endif %}
+
+{% if prometheus_memcached_exporter_targets is defined %}
+  # Memcached exporter #
+  - job_name: memcached
+    scrape_interval: 30s
+    scrape_timeout: 10s
+    static_configs:
+      - targets:
+{% for target in prometheus_memcached_exporter_targets %}
+        - {{ target }}:9150
+{% endfor %}
+    relabel_configs:
+      - source_labels: [ __address__ ]
+        target_label: instance
+        regex: '(.*):9150'
+        replacement: '${1}'
+{% endif %}

templates/systemd/prometheus-memcached-exporter.service.j2

@@ -0,0 +1,11 @@
+[Unit]
+Description=Prometheus Memcached Exporter
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/prometheus-memcached-exporter
+EnvironmentFile=/etc/default/prometheus-memcached-exporter
+
+[Install]
+WantedBy=multi-user.target