From Thomas Alfred's question: https://answers.atlassian.com/questions/36116043/can-atlassian-connect-web-panels-be-aware-of-the-page-and-space

Is it possible to allow a web panel to be aware of the space & page it is displayed on, much in the same way that dynamic content macros can have templated URLs to pass space.key, page.id etc through to the add-on.

I'd really like something like this in the atlassian-connect.json file, but have checked that this doesn't work:

"webPanels": [
    {
        "url": "/atl-footer.html?space_key={space.key}&page_id={page.id}",
        "location": "atl.footer",
        "weight": 500,
        "key": "my-atl-footer",
        "name": {
            "value": "Main dialog area"
        }
    }
],

In this use case, the webpanel is sending a tracking beacon to an analytics product. While it's possible to get the user key if required, it would be helpful to also send the space key & page id (where applicable) so that pages can be grouped by space key in the analytics product. Having pageId would be handy if this was needed later.

atl.footer is a convenient place as it loads last and is often out of view, so the initial "Loading Acme Add-on" would not be too annoying when loading the page.