Managed service docs

[jackkleeman]

Fixes https://github.com/restatedev/kube-manifests/issues/13

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[tillrohrmann]

Thanks for creating the description @jackkleeman. I had a question about Grafana which was not fully clear to me.

Before merging it, I'd like to try out myself. So if you could create me a cluster or give me access to an existing one, that be great.

[tillrohrmann]

Thanks a lot for updating the documentation @jackkleeman. I've tried things out and the interaction via the API-gateway works very smoothly :-)

For the observability part, I have to admit that I struggled a bit (probably because I suck at configuring Grafana) and I couldn't get the lambda-proxy work. When using the lambda proxy, the discovery timed out, probably I have something misconfigured.

[slinkydeveloper]

Just skimmed over it. I wonder if this page should be in the Deployment section? Or at least have a link there?

[tillrohrmann]

Nice work! +1 for merging :-)