This commit exposes a new Prometheus to track the number of
reconciliation attempts. This is important, as without this, the number
of errors it not too helpful. A more valuable statistic is the
proportion of reconciliations that result in an error.
This commit introduces liveness checks to Kilo. This allows the Kilo
daemons to take nodes with inactive or dead Kilo deamons out of the
topology until they are alive again.
Today, net.Listen will only listen on 127.0.0.1 if localhost is passed
[0]. Listening on `:8080` will open a dualstack socket on OSs that
support it.
[0] https://github.com/golang/go/issues/9334
