Continuing the discussion from Heads up! Upcoming breaking change in the Template integration:
since Ha 115 checks for all states mentioned in a template sensor continuously now, below template causes havoc in my system (with a lot of states)
various alternatives were suggested, from leaving it out, cutting my system, or rewriting using an automation and an input_text. The latter would be most suitable were it not that that has a max Character limit of 255,which, obviously isnt near suitable for showing a longer list of entities (that can have long names themselves) in a frontend sensor card. We need to steer away from a sensor template, and a python script seems most appropriate.
Have an automation or script handle running the script, and have that script write to a sensor which can have as many attributes as we need, with as many characters as we need.
Now my original template sensor was this:
sensor:
# https://gist.github.com/jazzyisj/45fce29d825b8f9b29c5974444299d90
# https://community.home-assistant.io/t/sensor-unavailable-offline-detection/147618/10
# https://community.home-assistant.io/t/how-to-list-all-sensors-with-state-unavailable-none-or-unknown/154606
- platform: template
sensors:
entities_unavailable:
# entity_id:
# - script.update_entities_uun
# - automation.check_for_unavailable_entities
friendly_name: Entities Unavailable
value_template: >
{% set ignore_list = ['light.driveway_floodlight','light.garden_backyard_floodlight','light.garden_terrace_floodlight',
'light.porch_floodlight','light.parking_light'] if
is_state('binary_sensor.outside_daylight_sensor','on') else [] %}
{% set unavailable = states|selectattr('state','eq','unavailable')
|rejectattr('entity_id','in',state_attr('group.entity_blacklist','entity_id'))
|rejectattr('entity_id','in',ignore_list)
|rejectattr('domain','eq','media_player')
|list %}
{{unavailable|count}}
# {% if states('sensor.entities_unavailable')|int > 0 %} mdi:thumb-down
# {% else %} mdi:thumb-up
# {% endif %}
entities_uun:
# entity_id:
# - script.update_entities_uun
# - automation.check_for_unavailable_entities
friendly_name: Entities U/U/N
value_template: >
{% set ignore_list = ['light.driveway_floodlight','light.garden_backyard_floodlight','light.garden_terrace_floodlight',
'light.porch_floodlight','light.parking_light'] if
is_state('binary_sensor.outside_daylight_sensor','on') else [] %}
{{states|selectattr('state','in',['unavailable','unknown','none'])
|rejectattr('entity_id','in',ignore_list)
|rejectattr('entity_id','in',state_attr('group.entity_blacklist','entity_id'))
|rejectattr('domain','in',['group','media_player'])
|list|length}}
attribute_templates:
Unknown: >
{% set unknown = states|selectattr('state','eq','unknown')
|rejectattr('entity_id','in',state_attr('group.entity_blacklist','entity_id'))
|rejectattr('domain','in',['group'])
|map(attribute='entity_id')
|list %}
{% if unknown|count == 0 %} 0
{% else %}
{{unknown|count}}:
{{'\n' + unknown|join(',\n')}}
{% endif %}
Unknown sensors: >
{% set unknown = states.sensor|selectattr('state','eq','unknown')
|rejectattr('entity_id','in',state_attr('group.entity_blacklist','entity_id'))
|map(attribute='entity_id')
|list %}
{% if unknown|count == 0 %} 0
{% else %}
{{unknown|count}}:
{{'\n' + unknown|join(',\n')}}
{% endif %}
Unavailable: >
{% set ignore_list = ['light.driveway_floodlight','light.garden_backyard_floodlight','light.garden_terrace_floodlight',
'light.porch__floodlight','light.parking_light'] if
is_state('binary_sensor.outside_daylight_sensor','on') else [] %}
{% set unavailable = states|selectattr('state','eq','unavailable')
|rejectattr('entity_id','in',state_attr('group.entity_blacklist','entity_id'))
|rejectattr('entity_id','in',ignore_list)
|rejectattr('domain','eq','media_player')
|map(attribute='entity_id')
|list %}
{% if unavailable|count == 0 %} 0
{% else %}
{{unavailable|count}}:
{{'\n'}}{{unavailable|join(',\n')}}
{% endif %}
None: >
{% set none_ = states|selectattr('state','eq','none')
|map(attribute='entity_id')
|list %}
{% if none_|count == 0 %} 0
{% else %}
{{none_|count}}:
{{'\n' + none_|join(',\n')}}
{% endif %}
Full: >
{% set full = states|selectattr('state','in',['unavailable','unknown','none'])
|map(attribute='entity_id')
|list %}
{{full|count}}:
{{'\n' + full|join(',\n')}}
rather large, I admit, but it was very useful. Have it run after a delayed startup, check any red flags, fix if possible, run again to see if things got better, and where to look for issues (imagine a weather integration not initializing or whatever other integration) If alright, dont look back and leave alone.
Previously that could be done by setting the entity_id in the sensors config, as you can see above, now commented.
@VDRainer already started with a bare python_script, which does what the bottom attribute Full in my template sensor does, write the full unfiltered list :
count = 0
attributes = {}
for entity_id in hass.states.entity_ids():
state = hass.states.get(entity_id).state
if state in ['unavailable','unknown','none']:
attributes[entity_id] = state
count = count + 1
attributes['friendly_name'] = 'Unavailable Entities'
attributes['icon'] = 'mdi:message-alert-outline'
hass.states.set('sensor.unavailable_entities', count, attributes)
which runs alright.
I would love to expand on that by at least having the states ‘none’, ‘unavailable’, and ‘unknown’ in their own ordered lists (attributes).
further more, we really need the ignore_list and black_list filtering, along with a few domain rejectors 
Not really knowing where to start here, I turn to the community for assistance, please have a look if you can help me out here?
would be much appreciated! thanks…
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