RPi-Monitor VS Pi.Alert

Rpi-monitor

I found this: https://github.com/XavierBerger/RPi-Monitor/issues/199

Have a look at Rpi-Monitor as it has a number of monitors out of the box and is easily extensible if you want to add additional ones. It would have helped identify your increasing memory usage over time.

I really like a monitoring tool with web UI like RPI Monitor. Ex: screenshot

In case you have the system in a SD Card, I will also recommend to install log2ram (https://pimylifeup.com/raspberry-pi-log2ram/) . A hardware monitor will be interesting, like rpimonitor (https://github.com/XavierBerger/RPi-Monitor) and last but not least, you can add a WIFI / LAN intruder detector with Pi.Alert ( https://github.com/pucherot/Pi.Alert)

When using PiAlert make sure you use the fork https://github.com/jokob-sk/Pi.Alert and not the very outdated original.

For those of you who may seek help on this subject, kind leiweibau helped me in this and that conversations. There is a better and actively developed fork of this project in leiweibau's github repo. So you may want to use it.

Pi.Alert - original is here but there are more recent forks with additional features, such as this one.

/u/thekrautboy probably has the best and simplest option with Apprise here, but, if you're willing to get your hands dirty and just wanting to get the notifications in Gotify rather than email, you could modify the pialert.py script and change the send_email command to a send_gotify one using the Python documentation from Gotify here.

I just learned about https://github.com/pucherot/Pi.Alert

Pi Alert will do the job