I'm running native netdata on an RPi 3, with a few custom python collectors to monitor my local network.
It seems that a recent update has made all of my collectors disappear from the dashboard. Nothing strange is found in any of the netdata logs.
My current installation: v1.39.0-89-nightly, installed from apt, set to auto-update, on an RPi 3 running bullseye.
Seems that starting from netdata v1.39.0, all external collectors were split out to dedicated packages. Because of reasons.
On an apt based installation, you simply need to install all of them manually:
apt-cache depends netdata | \
awk '/Recommends:/ {system("sudo apt-get install "$2"; sudo apt-mark auto "$2)}'
And then restart the service:
sudo systemctl restart netdata
For other installations, check out this netdata blog post: https://blog.netdata.cloud/split-plugin-packages/