Create thanos namespace labelling for staging vs production.
SRE Support Needed
We need to differentiate thanos-staging from thanos as far as the various thanos related SLIs and dashboards go.
The issue is that presently, we have created our own environment for thanos and are overriding the environment variables here:
We do this because thanos sits outside of our usual environments and looks across all of them (gprd, gstg, ops, pre, etc).
The problem is that thanos-staging does as well, and we need a clear way to differentiate staging specific thanos metrics (particularly those around rule evalulation and the like) from the current thanos environment.
The best label to set as a differentiator is namespace (thanos vs thanos-staging) but that's not trivial to do in the jsonnet. I'd also love to come up with a way to differentiate it on the dashboards easily with a dropdown.