import.http "libstd" {
	url = "https://git.kkarolis.lt/karolis/Alloy/raw/branch/main/lib/std.alloy"
}

declare "openwrt" {
	argument "forward_to" {
		optional = false
		comment  = "Where to forward the scraped metrics"
	}

	argument "host" {
		optional = true
		comment  = "The host OpenWRT collector is running on"
		default  = sys.env("GCLOUD_FM_COLLECTOR_ID")
	}

	libstd.load_host_config "load_config" {
		host        = argument.host.value
		config_file = "OpenWRT/config.yaml"
	}

	discovery.relabel "openwrt_node_exporter" {
		targets = libstd.load_host_config.load_config.config.targets

		rule {
			source_labels = ["hostname"]
			target_label  = "__address__"
			replacement   = "$1:9100"
		}

		rule {
			action      = "labelmap"
			regex       = "hostname"
			replacement = "instance"
		}

		rule {
			action = "labeldrop"
			regex  = "hostname"
		}
	}

	prometheus.scrape "openwrt_node_exporter" {
		targets    = discovery.relabel.openwrt_node_exporter.output
		forward_to = argument.forward_to.value
	}

	export "targets" {
		value = discovery.relabel.openwrt_node_exporter.output
	}
}