Transitioning from push-based to pull-based monitoring with
Prometheus/collectd. The *write_prometheus* plugin will be installed on
all hosts, and Prometheus will be configured to scrape them directly.
*vmhost0.pyrocufflink.blue* no longer uses `dhcpcd` for network
configuration, but *systemd-networkd*.
The host-specific network settings for a VM host include the
configuration for the management interface, as well as the configuration
of the physical ports that make up the bonded interfaces.
The VM hosts have multiple network interfaces with IPv6 addresses, so
collectd may not always choose the correct one to send metrics. Thus we
have to explicitly tell it to use the management interface, to avoid it
sending data on the SAN interface.
Dustin