What tools like these need is monitoring capacity. Hook your diagrams to your logs and health status, and then you have a compelling reason to actually keep them up to date.
Yeah I was thinking something like this too, hopefully someone makes this if it hasn't been already.
If the diagrams had some linkage to your code you'd be able to see what a failed unit test means in the overall context of the app, what code is used in which block, what protocol is used for connections between blocks, a summary of what each block does etc...
A monitoring tool as you say - and since you'll use it often you'll probably keep it up to date
Kind of more limited to a 200OK-level health check, but Structurizr does support basic checks like this (https://structurizr.com/help/health-checks) - though I do love the idea of being able to add links to an object so you could jump the log page of that service in your logging platform.
