A way to show in front end that (which) automation has triggered?

Yes, I use this automation:

- alias: Automation ran
  id: 'Automation ran'
  initial_state: 'off'
  trigger:
    platform: event
    event_type: state_changed
  condition:
    condition: template
    value_template: >
      {% set skip_list = ['automation_ran', 'count_warnings', 'count_errors',
                           'activate_map_sensors_actueel', 'call_family_home',
                           'timed_python_scripts_per_20_secs'] %}
      {{ trigger.event.data.entity_id.startswith('automation.') and
         trigger.event.data.entity_id.split('.')[1] not in skip_list and
         'old_state' in trigger.event.data and 'new_state' in trigger.event.data }}
  action:
    - condition: template
      value_template: >
        {{ trigger.event.data.new_state.attributes.last_triggered !=
           trigger.event.data.old_state.attributes.last_triggered }}
    - service: notify.filed_automations
      data_template:
        message: >
         {{ as_timestamp(trigger.event.data.new_state.last_updated)|timestamp_custom("%d %b: %X") }}: {{ trigger.event.data.new_state.name }}
    - service: python_script.last_automation
      data_template:
        event: '{{ trigger.event }}'

with this python script:

last_automation.py

# Get params
event = data.get('event')
#logger.error("LAST AUTOMATION: " + str(event))
# Sample: <Event call_service[L]: domain=automation, service=trigger, service_data=entity_id=automation.call_service_event_automation, service_call_id=1972124944-486>

# Find the automation name
#** pos_start = event.find('entity_id=')+10
pos_start = event.find('entity_id=')+21
pos_end = event.find(',', pos_start)

# Get the entity_id
#** entity_id = event[pos_start:pos_end]
entity_id = 'automation.' + event[pos_start:pos_end]

# get the state object
state = hass.states.get(entity_id)

# Make a time string in 24 hour format
#time_string = datetime.datetime.now().strftime('%I:%M')
dt = datetime.datetime.now() #state.attributes.get('last_triggered') #
time = "%02d:%02d:%02d" % (dt.hour, dt.minute, dt.second)
# try to get the automation friendly name
msg = []

try:
    msg = state.name
except:
    msg = None

if msg:
   if not msg.startswith('Set '):
       # Sensor update
       hass.states.set('sensor.last_automation', msg, {
#            'custom_ui_state_card': 'state-card-value_only',
#            'text': sensor_message,
            'unit_of_measurement': 'Aut',
            'friendly_name': time,
            'entity_picture': '/local/buttons/play-mode-repeat.png' })

then use the sensor sensor.last_automaton in frontend.

beware, if automation heavy, it can be a burden to the system. so you might want to comment out several automations in the skip list as I did.

I use this in my Home dashboard card, and have the automation there to en/disable on demand:

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