add metric for last poll time

[si458]

Is your feature request related to a problem? Please describe.
the is currently an issue with the API and retrieving data (about 2.30am it just stopped)

Describe the solution you'd like
a metric to show the last poll time of your smart meters,
so you can do something when the is an outage like a notification

Describe alternatives you've considered
checking the raw API directly shows the lasttime they polled your smart meter
https://api.glowmarkt.com/api/v0-1/resource/{resourceId}/last-time

{
  "status": "OK",
  "name": "electricity consumption",
  "resourceTypeId": "e3a5db34-6e0c-4221-9653-8d33e27511ba",
  "resourceId": "5dbf33f3-1410-4334-a703-a3f9ad645a93",
  "classifier": "electricity.consumption",
  "data": {
    "lastTs": 1635820200
  }
}

Additional context

[ColinRobbins]

That data is already available - see top right.

[si458]

@ColinRobbins how do you do something on this though?
like if its not had any data in say 2 hours send a notification?

[ColinRobbins]

In the past, I have used a timer for that.

1. create an automation that triggers when the value changes.
2. in the automation start a timer helper.
3. if the value changes again, reset the timer.
4. if the timer expires, create a notification.