Can't scrape the Prometheus node_exporter if it's a LaunchDaemon and the macOS firewall is up

[DrJosh9000]

Hi,

Not sure if there's just something weird with my Mac. But when I run the node_exporter brew service as a LaunchDaemon (i.e. sudo brew services start node_exporter) I couldn't scrape it from my Prometheus server, even if I clicked "Allow" on the macOS firewall popup.

I found a workaround, which was to add this to /usr/local/opt/node_exporter/homebrew.mxcl.node_exporter.plist:

	<key>SockServiceName</key>
	<string>9100</string>

But I don't trust the file to remain stable on upgrade.
Is this plist key being missing a bug in the formula?