Pushover urls api support

[vljukap98]

Describe the feature request

On Pushover alerting, currently we can add a custom description to the Pushover notification alert message, e.g.:
An alert for xyz has been triggered due to having failed N time(s) in a row with the following description: My custom message X - FAILED CONDITION

Now if I try and add a http link url in the description and when receiving the notification, that url is just pure text, but I want to be able to click on it. See more Pushover urls API

Why do you personally want this feature to be implemented?

The reason I want this is being able to click on the link and see if the endpoint health check is still failing for that same url. I managed to dynamically set up my endpoint configuration with description for pushover pointing to a yml anchor I created for the endpoint url property. This is a minimal example:

endpoints:
- name: xyz
  url: &xyz-url https://my-url.com
  alerts:
  - type: pushover
    description: *xyz-url

How long have you been using this project?

No response

Additional information

Is there any reason why the endpoint url failing isn't included in the notification message at all, because it's really convenient to click that endpoint and check whether it works now.

[vljukap98]

How I would do it is by adding an additional property Url string json:"url,omitempty" in the Body struct inside pushover module, and then inside buildRequestBody function set this property value to ep.URL (endpoint's defined url value).