We developed an app that does resources (CPU, disk, RAM) monitoring for Cloudron. Cloudron currently does a wonderful job for quite many things, but it was a couple of times when I was finding that the disk is overflown, or my server is running out of RAM, after the apps stopped responding.
I understand you can always setup Zabbix, etc, but those systems are quite complicated to setup and I wanted to keep the spirit of 'simply works' of Cloudron.
So, we created a software called nomon. The original name's meaning is 'no-monitor' - as a follow for (now falling) trend of 'no-code' things, 'no cloud' (as it requires no cloud services) and to reflect it's simplicity - as it's not that much a monitor - just a simple service that makes it best to inform on the resources shortage.
With this said, we would like it to be added to the Cloudron AppStore, ideally keeping the source code at GitHub, as we got a few automations, including building and pushing to GitHub Docker registry there.