My home assistant 'dynamic alert template' that I use on my phone and home assistant dashboard.

status-widget.yaml

<p style="text-align: start">
  {%- if states('input_boolean.holiday_mode') == "on" -%}
    {#- Holiday Mode -#}
    🇬🇧 {{ now().timestamp() | timestamp_custom('%I:%M %p') }}<br>
  {%- else %}
    {#- Not Holiday Mode -#}
    {#- Shell Home/Away -#}
    {# {%- if states('person.shell') != "home" %} 
      👰 Away ({{ relative_time(states.person['shell'].last_changed) }} ago)<br> #}
    {# {%- else %}
      👰 Home ({{ relative_time(states.person['shell'].last_changed) }} ago)<br> #}
    {# {%- endif %} #}
  {%- endif %}
  {%- if not is_state('sensor.resting_heart_rate', 'unknown') and not is_state('sensor.resting_heart_rate', 'unavailable') -%}
    ❤️ {{ states('sensor.resting_heart_rate') | round }} bpm<br>
  {%- endif %}
  {%- if not is_state('sensor.calories', 'unknown') and not is_state('sensor.calories', 'unavailable') -%}
    {# 🔥 {{ states('sensor.calories') | round }} calories<br> #}
  {%- endif %}

  {#- Battery States -#}
  {%- set result = namespace(sensors=[]) -%}
  {%- set exclude_entity_id = 
    [
      "sensor.0xa4c138b759140edb_battery",
      "sensor.x10_security_0d1c00_32_battery",
    ]
  -%}
  {%- for state in states.sensor | selectattr('attributes.device_class', '==', 'battery') -%}
    {%- if 0 <= state.state | int(-1) < 16 | int and not state.entity_id in exclude_entity_id -%}
      {%- set result.sensors = result.sensors + ['<b>' ~ state.name ~ ' ' ~ state.state ~ '%</b><br>'] -%}
    {%- endif -%}
  {%- endfor -%}
  {%- for state in states.binary_sensor | selectattr('attributes.device_class', '==', 'battery') | selectattr('state', '==', 'on') -%}
    {%- if not state.entity_id in exclude_entity_id -%}
      {%- set result.sensors = result.sensors + [state.name] -%}
    {%- endif -%}
  {%- endfor -%}
  {{result.sensors|join('<br>')|replace(' Battery ', ' 🪫 ')}}

  {# - Check ZIgbee Device Count -#}
  {%- if states('input_number.zigbee2mqtt_device_count') < states('input_number.zigbee2mqtt_expected_device_count') -%}
    ZigBee device has dropped<br>
  {%- elif states('input_number.zigbee2mqtt_device_count') > states('input_number.zigbee2mqtt_expected_device_count') -%}
    New ZigBee devices added, increase expected count<br>
  {%- endif -%}

  {#- Offline Devices -#}
  {%- set ignore_list = [
      "EPSON XP-750 Series",
      "Plex (Plex for Android (Mobile) - Pixel 7)",
      "Plex (Plex for Android (TV) - Chromecast Google TV)",
      "Plex Client Service",
      "3D Printer AMS",
      "Dressing room speaker",
      "Tank Night Light",
      "Tank UVB Light",
      "Downstairs Motion",
      "Gecko Egg Motion",
      "Bathroom speaker",
      "Gecko Eggs",
      "Alecs Office - LED 2",
      "Alecs Office - LED 3",
      "Alecs Office - LED 4",
      "Alecs Office - LED 5",
      "Alecs Office - LED 6",
      "Alecs Office - LED 7",
      "Alecs Office - LED 8",
      "Google Generative AI",
      "Google Pixel Watch",
      "PT2262 ffffff",
      "PT2262 025100",
      "PT2262 bc7a7b",
      "PT2262 c00200",
      "PT2262 8ce540",
      "PT2262 a80481",
      "PT2262 c14320",
      "PT2262 bdffff",
    ]
  -%}
  {%- if states('input_boolean.holiday_mode') == "on" -%}
    {%- set holiday_ignore_list = [
        "Living Room TV",
        "Living Room speaker",
        "Bedroom speaker",
        "Chromecast",
        "Main Bedroom Bed Light",
        "Upstairs",
        "Kitchen display",
        "Office display",
        "3D Printer Plugs",
        "Fly Tub",
      ]
    -%}
    {%- set normal_ignore_list = ignore_list -%}
    {%- set ignore_list = holiday_ignore_list + normal_ignore_list -%}
  {%- endif %}
  {#- list all devices that have at least one unavailable entity -#}
  {% set suspicious_devices = states | rejectattr('state','ne','unavailable') | map(attribute='entity_id') | map('device_id') | unique | reject('eq',None) | list -%}
  {%- set ns = namespace(unavailables = []) -%}
  {%- for device_id in suspicious_devices -%}
   {%- set ids = device_attr(device_id, 'identifiers') -%}
   {%- set integration = 'unknown' if (not ids or ids|list|length == 0 or ids|list|first|length!=2) else ids|list|first|first -%}
   {#- exlude entities of i.e. powercalc which extends devices with power entities -#}
   {%- set entities= device_entities(device_id) -%}
   {%- set unavailable = expand(entities) | selectattr('state','eq','unavailable') |list|count -%}
   {#- don't count available entities of connection type -#}
   {%- set available = expand(entities) | selectattr('state','ne','unavailable') | list | count -%}
   {#- so count connection entities in error state -#}
   {%- set contypes = expand(entities) | selectattr('state','eq','off') | selectattr('attributes.device_class', 'defined') |selectattr('attributes.device_class','eq','connectivity') | list | count  -%}
   {%- if unavailable!=0 and available-contypes==0  -%}
     {#- preferably use named_by_user -#}
     {%- set name = device_attr(device_id, 'name_by_user') -%}
     {%- set name = device_attr(device_id, 'name') if name==None else name -%}
     {%- if (name != None) and (ignore_list|select('in', name)|list|length == 0) -%}
     {%- set ns.unavailables = ns.unavailables + [ name ] -%}
     {%- endif -%}
   {%- endif -%}
  {%- endfor -%}
  {%- set ns.unavailables = ns.unavailables + [""] -%}
  {{ns.unavailables|join(' is offline<br>\n')|replace('X10 Security 0d1c00:32 is offline','RFXCOM needs initialising')}}
  
  {#- Front Door States -#}
  {%- if states("binary_sensor.front_door_contact") == "on" -%}
    <b>Front door open</b><br>
  {%- endif %}
  {%- if states("lock.front_door_lock") != "locked" -%}
  <b>Front door unlocked</b><br>
  {%- endif %}

  {#- Gate States -#}
  {%- if states("binary_sensor.gate_contact") == "on" -%}
    <b>Gate open</b><br>
  {%- endif %}

  {#- Shed States -#}
  {%- if states("binary_sensor.door_shed") == "on" -%}
    <b>Shed open</b><br>
  {%- endif %}
  
  {#- Back Door States -#}
  {%- if states("binary_sensor.back_door_contact") == "on" -%}
    <b>Back door open</b><br>
  {%- endif %}

  {#- Sliding Back Door States -#}
  {%- if states("binary_sensor.sliding_back_door_contact") == "on" -%}
    <b>Sliding Back door open</b><br>
  {%- endif %}
  
  {#- Vaccum State -#}
  {%- if is_state("vacuum.robot_vacuum", "unavailable") and states('input_boolean.holiday_mode') == "off" -%}
  <b>Vacuum has lost WiFi connection</b><br>
  {%- endif %}
  {%- if is_state("vacuum.robot_vacuum", "cleaning") -%}
  <b>🧹 Cleaning</b><br>
  {%- endif %}
  {%- if states("sensor.robot_vacuum_filter_lifespan") | int < 0 -%}
  Vacuum filter needs replacing<br>
  {%- endif %}
  {%- if states("sensor.robot_vacuum_main_brush_lifespan") | int < 0 -%}
  Vacuum main brush needs replacing<br>
  {%- endif %}
  {%- if states("sensor.robot_vacuum_side_brushes_lifespan") | int < 0 -%}
  Vacuum side brushes need replacing<br>
  {%- endif %}
  {%- if states("sensor.robot_vacuum_unit_care_lifespan") | int < 0 -%}
  Vacuum needs standard maintenance<br>
  {%- endif %}

  {#- Lawn Mower State -#}
  {%- if is_state("lawn_mower.robot_lawn_mower", "unavailable") and states('input_boolean.holiday_mode') == "off" -%}
  <b>Lawn Mower has lost WiFi connection</b><br>
  {%- endif %}
  {%- if is_state("lawn_mower.robot_lawn_mower", "cleaning") -%}
  <b>🧑‍🌾🚜 Mowing Grass</b><br>
  {%- endif %}
  {%- if states("sensor.robot_lawn_mower_blade_lifespan") | int < 0 -%}
  Lawn mower blades need replacing<br>
  {%- endif %}
  {%- if states("sensor.robot_lawn_mower_lens_brush_lifespan") | int < 0 -%}
  Lawn mower lens requires cleaning<br>
  {%- endif %}
  
  {#- Terrarium 3 State -#}
  {%- if states("sensor.0x00158d000ae0f3de_temperature") | float > 30 -%}
    {%- set font_colour = "red" %}
  {%- elif states("sensor.0x00158d000ae0f3de_temperature") | float < 18 -%}
    {%- set font_colour = "blue" %}
  {%- else -%}
    {%- set font_colour = "" %}
  {%- endif %}
  {%- if font_colour != "" -%}
    <font color="{{ font_colour }}"><b>Terrarium 3 🌡️</b> {{ states('sensor.0x00158d000ae0f3de_temperature') }}°c<br></font>
  {%- endif %}
  
  {%- if states("sensor.0x00158d000ae0f3de_humidity") | float > 96 -%}
    {%- set font_colour = "red" %}
  {%- elif states("sensor.0x00158d000ae0f3de_humidity") | float < 60 -%}
    {%- set font_colour = "blue" %}
  {%- else -%}
    {%- set font_colour = "" %}
  {%- endif %}
  {%- if font_colour != "" -%}
    <font color="{{ font_colour }}"><b>Terrarium 3 💧</b> {{ states('sensor.0x00158d000ae0f3de_humidity') }}%<br></font>
  {%- endif %}

  {%- if not states("binary_sensor.terrarium_3_bt_lights_lumenize_led_1_ble_connected") -%}
    Connection Lost - Terrarium 3 LED<br>
  {%- endif %}
  {%- if not states("binary_sensor.terrarium_3_bt_lights_lumenize_pro_t5_1_ble_connected") -%}
    Connection Lost - Terrarium 3 UVB<br>
  {%- endif %}

  {#- Flies State -#}
  {%- if states("sensor.0x00158d000a840be6_battery") == "unavailable" -%}
    <b>Fly temperature sensor offline</b><br>
  {%- else -%}
    {%- if states("sensor.fly_tub_temperature") | float > 24 -%}
      {%- set font_colour = "red" %}
    {%- elif states("sensor.fly_tub_temperature") | float < 20 -%}
      {%- set font_colour = "blue" %}
    {%- else -%}
      {%- set font_colour = "" %}
    {%- endif %}
    {%- if font_colour != "" -%}
      <font color="{{ font_colour }}"><b>Flies 🌡️</b> {{ states('sensor.fly_tub_temperature') }}°c<br></font>
    {%- endif %}
  {%- endif %}
  {%- if state_attr('timer.fly_culture_ready', 'finishes_at') == None -%}
    🪰 <b>Culture Ready</b><br>
  {%- endif -%}
  
  {#- Eggs State -#}
  {# {%- if states("sensor.gecko_eggs_battery") == "unavailable" -%}
    <b>Egg temperature sensor offline</b><br>
  {%- else -%}
    {%- if states("sensor.gecko_eggs_temperature") | float > 27 -%}
      {%- set font_colour = "red" %}
    {%- elif states("sensor.gecko_eggs_temperature") | float < 25 -%}
      {%- set font_colour = "blue" %}
    {%- else -%}
      {%- set font_colour = "" %}
    {%- endif %}
    {%- if font_colour != "" -%}
      <font color="{{ font_colour }}"><b>Eggs 🌡️</b> {{ states('sensor.gecko_eggs_temperature') }}°c<br></font>
    {%- endif %}
  {%- endif %} #}
 
  {#- Printer State -#}
  {%- if states("sensor.3d_printer_print_status") == "running" -%}
    {%- set current_time = now() %}
    {%- set future_time = as_local(states("sensor.3d_printer_end_time") | as_datetime) %}
    {%- set time_difference = future_time - current_time %}
    🖨️ {{ as_timestamp(states("sensor.3d_printer_end_time")) | timestamp_custom('%d/%m/%Y %H:%M') }} ({{ relative_time(current_time - time_difference) }})<br>
  {%- endif %}

  {#- Filament Dryer State -#}
  {%- if states('sensor.0x00124b0022cead4c_humidity') | int < 20 and states('switch.3d_printer_plugs_l4') == "on" -%}
  Filament has been dried, humidity<br> {{states('sensor.0x00124b0022cead4c_humidity')|round}}%
  {%-endif-%}

  
  {#- Egg Hatched -#}
  {%- set minutes_since_gecko_egg_hatch = ((as_timestamp(now()) - as_timestamp(states.binary_sensor['0x00124b00292c587e_occupancy'].last_changed)) / 60)|int %}
  {%- if ( as_timestamp(states.binary_sensor['0x00124b00292c587e_occupancy'].last_changed) - as_timestamp(states('sensor.uptime')) ) > 5 -%}
    {%- if minutes_since_gecko_egg_hatch < 60 %}
      🥚 Egg hatched ({{ relative_time(states.binary_sensor['0x00124b00292c587e_occupancy'].last_changed) }} ago)
    {%- endif -%}
  {%- endif -%}
</p><br><br><br><br><br>