diff --git a/homeassistant/config/automations/it_maintenance/offline_detection_for_Z2M_devices_with_last_seen.yaml b/homeassistant/config/automations/it_maintenance/offline_detection_for_Z2M_devices_with_last_seen.yaml
new file mode 100644
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+++ b/homeassistant/config/automations/it_maintenance/offline_detection_for_Z2M_devices_with_last_seen.yaml
@@ -0,0 +1,13 @@
+id: offline_detection_for_Z2M_devices_with_last_seen
+alias: Offline detection for Z2M devices with last_seen
+description: 'Offline detection for Z2M devices with last_seen'
+use_blueprint:
+  path: Mr-Groch/offline-notification-for-sensors-with-last_seen.yaml
+  input:
+    time: '20:00:00'
+    hours: 12
+    actions:
+    - service: notify.marco
+      metadata: {}
+      data:
+        message: 'These Zigbee devices might be offline: {{sensors}}'
diff --git a/homeassistant/config/automations/it_maintenance/offline_detection_for_z2m_devices_with_sensor.yaml b/homeassistant/config/automations/it_maintenance/offline_detection_for_z2m_devices_with_sensor.yaml
new file mode 100644
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+++ b/homeassistant/config/automations/it_maintenance/offline_detection_for_z2m_devices_with_sensor.yaml
@@ -0,0 +1,18 @@
+id: offline_detection_for_z2m_devices_with_sensor
+alias: Offline detection for Z2M devices with sensor z2m_offline_devices
+description: "Offline detection for Z2M devices with sensor z2m_offline_devices"
+mode: single
+trigger:
+  - platform: state
+    entity_id:
+      - sensor.z2m_offline_devices
+    from: null
+    to: null
+condition: []
+action:
+  - service: notify.marco
+    metadata: {}
+    data:
+      message: >-
+        The following Zigbee Devices are offline
+        {{states('sensor.z2m_offline_devices')}}
diff --git a/homeassistant/config/blueprints/automation/Mr-Groch/offline-notification-for-sensors-with-last_seen.yaml b/homeassistant/config/blueprints/automation/Mr-Groch/offline-notification-for-sensors-with-last_seen.yaml
new file mode 100644
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--- /dev/null
+++ b/homeassistant/config/blueprints/automation/Mr-Groch/offline-notification-for-sensors-with-last_seen.yaml
@@ -0,0 +1,76 @@
+blueprint:
+  name: Offline detection for Z2M devices with last_seen
+  description: Regularly test all sensors with 'last_seen' in name and 'timestamp'
+    device_class ('last seen' Z2M sensors) to detect offline and if so execute an
+    action.
+  domain: automation
+  input:
+    hours:
+      name: Hours not seen
+      description: Sensors not seen this amount of time are assumed to be offline.
+      default: 24
+      selector:
+        number:
+          min: 1.0
+          max: 168.0
+          unit_of_measurement: h
+          mode: slider
+          step: 1.0
+    time:
+      name: Time to test on
+      description: Test is run at configured time
+      default: '10:00:00'
+      selector:
+        time: {}
+    day:
+      name: Weekday to test on
+      description: 'Test is run at configured time either everyday (0) or on a given
+        weekday (1: Monday ... 7: Sunday)'
+      default: 0
+      selector:
+        number:
+          min: 0.0
+          max: 7.0
+          mode: slider
+          step: 1.0
+    exclude:
+      name: Excluded Sensors
+      description: '''last seen'' sensors (from devices that you want to exclude)
+        to exclude from detection. Only entities with ''last seen'' in name and ''timestamp''
+        in device_class are supported, devices must be expanded!'
+      default:
+        entity_id: []
+      selector:
+        target:
+          entity:
+          - domain:
+            - sensor
+    actions:
+      name: Actions
+      description: Notifications or similar to be run. {{sensors}} is replaced with
+        the names of sensors being offline.
+      selector:
+        action: {}
+  source_url: https://gist.github.com/Mr-Groch/bf073b142b507e3b6f8154223f81803b
+variables:
+  day: !input day
+  hours: !input hours
+  exclude: !input exclude
+  sensors: '{% set result = namespace(sensors=[]) %} {% for state in states.sensor
+    | rejectattr(''attributes.device_class'', ''undefined'') | selectattr(''attributes.device_class'',
+    ''=='', ''timestamp'') %}   {% if ''last_seen'' in state.entity_id and not state.entity_id
+    in exclude.entity_id and (states(state.entity_id) == ''unavailable'' or ((as_timestamp(now())
+    - as_timestamp(states(state.entity_id))) > ((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 | join('', '') }}'
+trigger:
+- platform: time
+  at: !input time
+condition:
+- '{{ sensors != '''' and (day | int == 0 or day | int == now().isoweekday()) }}'
+action:
+- choose: []
+  default: !input actions
+mode: single