Investigate integration with ASP.NET Core OpenTelemetry support

It's possible that we don't need to do anything in particular to work with https://devblogs.microsoft.com/aspnet/improvements-in-net-core-3-0-for-troubleshooting-and-monitoring-distributed-apps/ because just using Application Insights as the sink might be sufficient. But we should do some experiments to find out.

Start by reading the linked ASP.NET Core troubleshooting and monitoring post, then investigate whether Application Insights as the sink is sufficient. Run experiments against the proposed integration and record whether any project-specific changes are needed; the issue is done when the required integration approach is established and documented.

Written by the indexing model from the issue text.