esphome/tests/components/prometheus/common.yaml

wifi:
  ssid: MySSID
  password: password1

sensor:
  - platform: template
    id: template_sensor1
    lambda: |-
      if (millis() > 10000) {
        return 42.0;
      } else {
        return 0.0;
      }
    update_interval: 60s

text_sensor:
  - platform: template
    id: template_text_sensor1
    lambda: |-
      if (millis() > 10000) {
        return {"Hello World"};
      } else {
        return {"Goodbye (cruel) World"};
      }
    update_interval: 60s

prometheus:
  include_internal: true
  relabel:
    template_sensor1:
      id: hellow_world
      name: Hello World
    template_text_sensor1:
      id: hello_text
      name: Text Substitution