System_log_event does not raise events

Any idea why I don’t see any events written on the screen when I start listening to system_log_event using the developer tools when there are clearly warnings and errors in my log in the meantime? I believe this is the reason that the following automation does not work.

alias: Send notification on error
  - platform: event
    event_type: system_log_event
  - service: persistent_notification.create
      title: Error occurred
      message: An error occurred in Home Assistant. Have a look at the log.

Here are some errors in my log which I would expect to trigger this automation:

2021-12-08 08:42:39 ERROR (MainThread) [homeassistant.components.zwave_js] Failed to connect: Cannot connect to host core-zwave-js:3000 ssl:default [Connect call failed ('', 3000)]
2021-12-08 08:42:39 WARNING (MainThread) [homeassistant.config_entries] Config entry 'Z-Wave JS' for zwave_js integration not ready yet: Cannot connect to host core-zwave-js:3000 ssl:default [Connect call failed ('', 3000)]; Retrying in background

Found it myself! Events for system_log_event must be explicitly enabled as clearly mentioned in the documentation: System Log - Home Assistant (

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even after setting that in the yaml, I still cannot listen to the system_log_event… it stays blank :confused:

Edit: found it, need to add the following:

  fire_event: true