Sensor functionality for system_log platform

Feature Requests
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1

I am trying to create a dashboard that gives me an overview of issues currently in my HA ( Systeembeheerdersdashboard in Dutch). Unavailable entities, system log errors, system health, and more. All at a glance, so maintaining the system becomes even easier.

To display a card on the dashboard with only system errors, I need a sensor that filters out the errors in the system log and carry them (max 10 errors to hold). I have searched the documentation, but it seems that this is not possible atm. The system_log integration seems to have actions and events, but not a sensor functionality.

Therefore my request is this: add sensor functionality to the platform of system_log .

( If someone knows a different solution to what I am trying to build, please let me know; I’m open to learn )

2

That is not where this information is available. It is available here:

Settings → Devices & Services → Entities Tab

Use the filter option on the left to filter for Status of unavailable or not provided.

Screenshot 2025-03-20 at 12-28-29 Settings – Home Assistant
Screenshot 2025-03-20 at 12-28-29 Settings – Home Assistant1875×643 22.9 KB

Or if you want to use a sensor in your own dashboard you will have to create a template sensor that reports entity ids (or names) of unavailable or unknown entities.

There is also a third party integration called TheWatchman that will create this sensor for you - but only for entities you have actually used in your configuration (e.g. in automations, scripts or dashboards) - not all entities.