HA Sensor offline entities

# sensor
  - trigger:
      - platform: time_pattern
        hours: "/1"
        minutes: 0
    sensor:
      - unique_id: z2m_last_seen_entities
        name: "Z2M Last Seen Entities"
        state: >
          {% set lapsed_hours = 36 %}
          {% set ns = namespace(count=0) %}
          {% for state in states.sensor | selectattr('entity_id', 'search', '.*_last_seen$')  %}
            {% if states(state.entity_id) == 'unavailable' or ((as_timestamp(now()) - as_timestamp(states(state.entity_id),0)) > ((lapsed_hours | int) * 60 * 60)) %}
              {% set ns.count = ns.count + 1 %}
            {% endif %}
          {% endfor %}
          {{ ns.count }}
        attributes:
          devices: >
            {% set lapsed_hours = 36 %}
            {% set result = namespace(sensors=[]) %}
            {% for state in states.sensor | selectattr('entity_id', 'search', '.*_last_seen$') %}
              {% if states(state.entity_id) == 'unavailable' or ((as_timestamp(now()) - as_timestamp(states(state.entity_id),0)) > ((lapsed_hours | int) * 60 * 60)) %}
                {% set result.sensors = result.sensors + [state.name | regex_replace(find='_last_seen', replace='') ~ ' (' ~ relative_time(strptime(states(state.entity_id), '%Y-%m-%dT%H:%M:%S%z', 'unavailable')) ~ ')'] %}
              {% endif %}
            {% endfor %}
            {{ result.sensors }}