Runtime Monitoring doc page is in need of review

[dandago]

Runtime Monitoring page says:

[[THIS IS IN NEED OF REVIEW]]

Opening an issue here so that it doesn't get overlooked.

[ReubenBond]

Resolved by #10328, which replaced the stale runtime-monitoring content with reviewed Orleans observability guidance, signal interpretation, incident runbooks, and a current OpenTelemetry sample.

Published documentation: https://dotnet.github.io/orleans/docs/host/monitoring/