Automation trigger help "logbook_entry"

I’m trying to trigger an automation when any of a set of entities within the browser_mod integration changes. I’ve tried a few techniques and had no success. The integration creates a new set of entities for each browser instance that successfully logs into HA, each looking like sensor.(browser instance tag)_functionalname. So my HA has a number of sensor.xxxxxx_browser_visibility and I want an automation to trigger whenever any of them switch to or from ‘visible’.
I hoped that I could do this with an event trigger using logbook_entry and a template like this:

alias: test
description: test for logbook trigger
triggers:
  - trigger: event
    event_type: logbook_entry
conditions:
  - condition: template
    value_template: "{{ 'Browser visibility' in trigger.event.name }}"
actions:
  - action: notify.notify
    metadata: {}
    data:
      message: browser_mod logbook
mode: single

It never triggers despite trying various options in the template (e.g. ‘browser_visibility’ and trigger.event.data.message). The logbook is definitely seeing events that match, e.g.

DJI-XPS15-Chrome Browser visibility changed to visible
09:28:21 - 3 seconds ago

The documentation appears to say that logbook_entries are events Events - Home Assistant. However I can’t find any successful examples or its use in a trigger posted in the community (some non-working ones eg Logbook entry as a trigger for automation - #7 by Hellis81).

So I tried a different approach by creating a template sensor. My approach was to keep a count of the visible browsers like this:

template:
  - sensor:
    - name: browser_users_visible
      state: >
        {{ integration_entities('browser_mod')|select('contains','browser_visibility')|expand|map(attribute='state')|select('eq','visible')|list|count }}
      attributes:
        who: >
          {{ integration_entities('browser_mod')|select('contains','browser_user')|reject('contains','agent')|expand|map(attribute='state')|reject('in','unavailable')|list|join(';') }}

Testing this out in developer tools indicates it is monitoring all the sensor.xxxxx_browser_visibility entities but making this the trigger of an automation only works occasionally (and I can’t see a pattern in its failure). I suspect there is a problem with the output from integration_entities('browser_mod') which I’ve used elsewhere with inconsistent results.

alias: UsersLog
description: Logs any change of browser_users
triggers:
  - entity_id:
      - sensor.browser_users_visible
    trigger: state
    to: 
conditions: []
actions:
  - target:
      entity_id: notify.logusers
    data:
      message: >-
        {{as_timestamp(now(),0)|timestamp_custom('%Y-%m-%dT%H:%M:%S',true,none)~','~states('sensor.browser_users')}},
        {{ states('sensor.browser_users_visible') }},
    action: notify.send_message
mode: queued
initial_state: "on"
max: 10

I’d be extremely grateful if anyone could spare a few minutes to tell me where I might be going wrong, or point me in a different direction. This is a step towards monitoring how much time my HA is being used for.

For anyone else trying to do this, I found a different method that seems to be working so far. See Maintaining a list of recent users with browser_mod - #4 by DJI