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Refine 2.0.0 concept documentation (#1742)

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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docs/concepts/logging/logging.md
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@ -11,6 +11,9 @@ MCP servers can expose log messages to clients through the [Logging utility].
[Logging utility]: https://modelcontextprotocol.io/specification/2025-11-25/server/utilities/logging
> [!IMPORTANT]
> Logging is **deprecated** as of MCP specification revision `2026-07-28` ([SEP-2577](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2577), [MCP9005](xref:list-of-diagnostics#obsolete-apis)) and may be removed in a future version.
This document describes how to implement logging in MCP servers and how clients can consume log messages.
### Logging levels
@ -32,8 +35,8 @@ different set of logging levels. The following table shows the levels and how th
| `emergency` | | System is unusable | |
**Note:** .NET's [ILogger] also supports a `Trace` level (more verbose than Debug) log level.
As there is no equivalent level in the MCP logging levels, Trace level logs messages are silently
dropped when sending messages to the client.
As there is no more verbose level in the MCP logging levels, Trace level log messages are mapped to
the MCP `debug` level when sent to the client.
[ILogger]: https://learn.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger
[ILoggerProvider]: https://learn.microsoft.com/dotnet/api/microsoft.extensions.logging.iloggerprovider