Is there a card which can display a list taken from the attributes of a state?

Configuration Frontend
1

I have a homebrew monitoring system and would like to use HA to display the services which are currently failing.

My current solution was to programatically rewrite ui-lovelace.yaml to add entities which failed to a card. This works but is very artisanal and I would like to avoid manipulating the config file.

The right solution would be to

  • update the state of an entity in HA, specifically to provide a dict of my monitoring endpoints with their status:
{
  "light1" : {
    "ok": True,
    "when": "<an iso date>",
  },
(...)
  • have a card which would iterate over this dict and conditionally display the ones which have a False status.

Ideally (but this is really a nice to have), it would be great if the condition could be switched in the card (that is have a switch whihc would show all the entries, or only the failed ones). But this is only a nice to have.

Alternatively a card which would list all the netrie would be OK as well (the state would hold only failed issues). Or even a card whihc would just display a list (that would be a list of the failed entities, without fancy dicts).

2

auto-entities card does all this