Imports github.com/prometheus/client_golang/prometheus github.com/prometheus/client_golang/prometheus/promhttp github.com/tailscale/tailscale-client-go/tailscale golang.org/x/oauth2/clientcredentials tailscale.com/tsnet tailscale.com/util/must Standard library imports context encoding/json flag fmt io log net net/http net/netip os strconv strings time