It's a simple measure to bring down how well connected is your node to one number.

We are trying to make this feature better, more nuanced and with some tips to improve health. In general, if you have 2-3 active channels with both receiving and spending capacities, not mixed public and private channels - then your node is good!

Here is more: https://guides.getalby.com/user-guide/alby-account-and-browser-extension/alby-hub/node/node-health