Just fyi your login page layout is busted on my phone.

Fixed, yeah I don't know why I thought it was a good idea to have the login button be of a fixed size. Thanks!

Same with Netdata (DataDog alternative) where only the agent seems to be open-sourced (so is DataDog’s BTW). Seems like a bait-and-switch.

The Netdata Agent is open source and you can self host your whole setup if you want. If you don't like the work, or don't know how to put it up yourself, and want to run multiple nodes, setup parent-child relations for your whole infra you can do it with Netdata Cloud (closed source). But even still, it only collects metrics, there's no actions or other data besides metadata being collected. What exactly is bait-and-switch with this model?

You are wrong. Netdata does have a paid hosted service, but you can self-host the whole thing.

Netdata doesn't have any paid service at the moment, event the Cloud service is free.

There are plans in the future for some paid plan but it won't remove features, it is more on having longer retention on metadata, role based access, support, etc.

You can find more details here https://www.netdata.cloud/pricing/

Including the cloud component? I can understand a freemium model, but an agent without the analytics service is “free” as in “free puppy”.

As far as I'm aware it is actually free for both agent and cloud. What do they have now is more than enough to understand the root of the issue.

It is ok to pay in the future for SSO.

My concern is not money at that moment, but the foot print on production system as data will be stored and queried next to prod with recently introduced anomaly advisor on top.

If by "cloud component" you mean the server that receives and stores metrics and serves the dashboard, then yes.

If you mean the paid registry thing that they sell, which allows you to keep track of your installations of Netdata on multiple servers, then no.

There is no central storage of data, data are stored on each monitored system in a database called dbengine, that's all. Cool, right? They do have a data privacy page: https://learn.netdata.cloud/docs/cloud/data-privacy

There is nothing paid, everything is free, both the agent and the cloud app. Do whatever you like with it. There is a pricing policy that will follow sometime in the future but everything that is free today seems that will remain free forever.