For AIX:

https://github.com/thorhs/node_exporter_aix/releases

Other ways to export metrics:

If you want to integrate your AIX into Prometheus monitoring, the best way imho is to use Nigel's njmon and telegraf agent to produce “Prometheus-compatible” output. It will deliver much more output as you can expect from the Node Exporter.

This is the link to Nigel's description - https://www.ibm.com/support/pages/nimon-working-prometheus

Telegraf for AIX can be found here - https://www.power-devops.com/telegraf https://nmon.sourceforge.io/pmwiki.php?n=Site.Njmon