Home-AssistantConfig/sensor/systemmonitor.yaml

- platform: command_line
  command: "grep -c 'Login attempt' /home/hass/.homeassistant/home-assistant.log"
  name: badlogin

- platform: systemmonitor
  resources:
    # - type: last_boot
    - type: since_last_boot

- platform: template
  sensors:
    since_last_boot_templated:
      value_template: >-
        {%- set slb = states.sensor.since_last_boot.state.split(' ') -%}
        {%- set count = slb | length -%}
        {%- set hms = slb[count - 1] -%}
        {%- set hms_trimmed = hms.split('.')[0] -%}
        {%- set hms_split = hms_trimmed.split(':') -%}
        {%- set hours = hms_split[0] | int -%}
        {%- set minutes = hms_split[1] | int -%}
        {%- set seconds = hms_split[2] | int -%}

        {%- if count == 3 -%}
          {{ slb[0] ~ ' ' ~ slb[1] ~ ' ' }}
        {%- endif -%}
        {%- if hours > 0 -%}
          {%- if hours == 1 -%}
            1 hour
          {%- else -%}
            {{ hours }} hours
          {%- endif -%}
        {%- endif -%}
        {%- if minutes > 0 -%}
          {%- if hours > 0 -%}
            {{ ', ' }}
          {%- endif -%}
          {%- if minutes == 1 -%}
            1 minute
          {%- else -%}
            {{ minutes }} minutes
          {%- endif -%}
        {%- endif -%}
        {%- if seconds > 0 -%}
          {%- if hours > 0 or minutes > 0 -%}
            {{ ', ' }}
          {%- endif -%}
          {%- if seconds == 1 -%}
            1 second
          {%- else -%}
            {{ seconds }} seconds
          {%- endif -%}
        {%- endif -%}