Added V2 from scratch

devenv/vagrant/opt/libvirt_exporter/libvirt_exporter.service

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+[Unit]
+Description=LibVirt Exporter for VM metrics
+Documentation=https://github.com/retspen/libvirt_exporter
+After=network-online.target
+
+[Service]
+Restart=always
+WorkingDirectory=/opt/libvirt_exporter-0.1.0.linux-amd64/
+ExecStart=/opt/libvirt_exporter-0.1.0.linux-amd64/libvirt_exporter --web.listen-address=localhost:9177
+
+[Install]
+WantedBy=multi-user.target

devenv/vagrant/opt/prometheus/prometheus.service

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+[Unit]
+Description=Prometheus Server 2.3.2
+Documentation=https://prometheus.io/docs/introduction/overview/
+After=network-online.target
+
+[Service]
+Restart=always
+WorkingDirectory=/opt/prometheus-2.3.2.linux-amd64/
+ExecStart=/opt/prometheus-2.3.2.linux-amd64/prometheus
+
+[Install]
+WantedBy=multi-user.target

devenv/vagrant/opt/prometheus/prometheus.yml

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+# my global config
+global:
+  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+  # scrape_timeout is set to the global default (10s).
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets:
+      # - alertmanager:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: 'libvirt'                              
+    static_configs:                                  
+      - targets: ['localhost:9177']