Add Metrics for Kernel

[einari]

• number of events per microservice and tenant
• Time spent in observer average per ms and pr tenant
• Number of failed observers
• Number of failed partitions per observer type
• Number of observed events
• Number of outbox events
• Number of inbox events

[einari]

https://github.com/open-telemetry/opentelemetry-dotnet/blob/1.0.0-rc9.7/src/OpenTelemetry/README.md

[einari]

https://learn.microsoft.com/en-us/azure/azure-monitor/app/opentelemetry-enable?tabs=net

[einari]

https://learn.microsoft.com/en-us/azure/azure-monitor/app/live-stream?tabs=dotnet6#get-started

[einari]

https://learn.microsoft.com/en-us/azure/azure-monitor/app/tutorial-asp-net-custom-metrics

[einari]

https://learn.microsoft.com/en-us/dotnet/core/diagnostics/metrics-collection

[einari]

https://www.meziantou.net/monitoring-a-dotnet-application-using-opentelemetry.htm

[einari]

https://dev.to/jmourtada/how-to-setup-opentelemetry-instrumentation-in-aspnet-core-23p5

[einari]

https://code-maze.com/tracking-dotnet-opentelemetry-metrics/