We are using git tags on the commit to figure out what is currently deployed where, e.g. "dev-stage", "test-stage" etc.

Sure, but that's best handled by Application reporting it via monitoring system. For example, at my company, we embed git commit, version and branch that last merge to main in container environment variables. Prometheus then exposes that as labels so we can just look any time it comes up. If we wanted to build a Grafana dashboard, that could be done easily as well.

I'm sure most monitoring systems have some way to loading that into their system.