OP#189 add the services

templates/prometheus-orune-timer.erb

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+[Unit]
+Description=Run Prometheus TSDB prune script every 6 hours
+
+[Timer]
+OnBootSec=10min
+OnUnitActiveSec=6h
+Persistent=true
+
+[Install]
+WantedBy=timers.target

templates/prometheus-prune-service.erb

@@ -0,0 +1,13 @@
+[Unit]
+Description=Prometheus TSDB prune service
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+Type=oneshot
+User=prometheus
+Group=prometheus
+EnvironmentFile=<%= @ps_env_file %>
+ExecStart=<%= @ps_pruning_file %>
+Nice=10
+IOWeight=80