Description
OpenTelemetry has become the de-facto standard for distributed, cross-platform tracing; it is being rapidly adopted both inside the .NET ecosystem and outside. OTel defines semantic conventions for how a database client emits metrics, which are aggregated, numeric counters about the state and performance of the driver (e.g. number of commands executed, idle/busy connections in the pool, etc.). these specifications are currently in experimental state, but stabilization is likely start happening soon.
Note that unlike with tracing, AFAIK there's no way to get data like this out of SqlClient at the moment. This sort of data can be invaluable in diagnosing performance problems (e.g. by inspecting real-time connection pool state) and tracking what's going on.