metropolis/node/core/metrics: configure node-exporter collectors

To have a better overview over the nodes we enable additional collectors
and tell the filesystem collector to not report high cardinality mountpoints.

Change-Id: I267c7c82d671f03c037aabcb067a06fdf29aef65
Reviewed-on: https://review.monogon.dev/c/monogon/+/1933
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/metropolis/node/core/metrics/exporters.go b/metropolis/node/core/metrics/exporters.go
index bef545c..2d2a74b 100644
--- a/metropolis/node/core/metrics/exporters.go
+++ b/metropolis/node/core/metrics/exporters.go
@@ -36,6 +36,10 @@
 		Executable: "/metrics/bin/node_exporter",
 		Arguments: []string{
 			"--web.listen-address=127.0.0.1:" + node.MetricsNodeListenerPort.PortString(),
+			"--collector.buddyinfo",
+			"--collector.zoneinfo",
+			"--collector.tcpstat",
+			"--collector.filesystem.mount-points-exclude=^/(dev|proc|sys|data/kubernetes/kubelet/pods/.+|tmp/.+|ephermal/containerd/.+)($|/)",
 		},
 	},
 }