When there's no DOM, read the pixels

The vendor's monitoring console is a fat desktop client. No API, no exportable metrics, nothing to scrape: someone glances at it twice a day and hopes.

Run the client on a container's display. A cron entry GETs the display's screenshot endpoint every fifteen minutes and hands the image to an agent with one question: is any gauge red, and what does the throughput number read? The agent answers from the pixels. Out-of-range means a notification on the on-call phone with the screenshot attached; normal means a logged value and silence.

The application never changed and never knew. Monitoring stopped requiring the vendor's cooperation the day the screen became an endpoint.