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Fold COREHOST_TRACE section into DOTNET_HOST_TRACE #54720

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Fold COREHOST_TRACE section into DOTNET_HOST_TRACE #54720

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a950b8b
Fold COREHOST_TRACE section into DOTNET_HOST_TRACE
am11 Jul 9, 2026
5aeae72
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am11 Jul 9, 2026
b84a0f9
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am11 Jul 9, 2026
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Update docs/core/tools/dotnet-environment-variables.md
am11 Jul 9, 2026
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17 changes: 3 additions & 14 deletions docs/core/tools/dotnet-environment-variables.md
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Expand Up @@ -217,7 +217,6 @@ This section describes the following environment variables:
- [`DOTNET_SKIP_WORKLOAD_INTEGRITY_CHECK`](#dotnet_skip_workload_integrity_check)
- [`DOTNET_TOOLS_ALLOW_MANIFEST_IN_ROOT`](#dotnet_tools_allow_manifest_in_root)
- [`DOTNET_HOST_TRACE`](#dotnet_host_trace)
- [`COREHOST_TRACE`](#corehost_trace)
- [`SuppressNETCoreSdkPreviewMessage`](#suppressnetcoresdkpreviewmessage)
- [Configure MSBuild in the .NET CLI](#configure-msbuild-in-the-net-cli)
- [`DOTNET_NEW_PREFERRED_LANG`](#dotnet_new_preferred_lang)
Expand Down Expand Up @@ -447,10 +446,11 @@ Specifies whether .NET SDK local tools search for tool manifest files in the roo

### `DOTNET_HOST_TRACE`

**This variable applies to .NET 10 and later versions.** For older versions, replace the `DOTNET_HOST_` prefix with [`COREHOST_`](#corehost_trace).

Controls diagnostics tracing from the hosting components, such as `dotnet.exe`, `hostfxr`, and `hostpolicy`.

> [!NOTE]
> Prior to .NET 10, the `COREHOST_` prefix was used instead of `DOTNET_HOST_` (for example, `COREHOST_TRACE`). The functionality and values remain identical.

- `DOTNET_HOST_TRACE=[0/1]` - default is `0` - tracing disabled. If set to `1`, diagnostics tracing is enabled.
- `DOTNET_HOST_TRACEFILE=<file path>` - has an effect only if tracing is enabled by setting `DOTNET_HOST_TRACE=1`. When set, the tracing information is written to the specified file; otherwise, the trace information is written to `stderr`.
- `DOTNET_HOST_TRACE_VERBOSITY=[1/2/3/4]` - default is `4`. The setting is used only when tracing is enabled via `DOTNET_HOST_TRACE=1`.
Expand All @@ -462,17 +462,6 @@ Controls diagnostics tracing from the hosting components, such as `dotnet.exe`,

The typical way to get detailed trace information about application startup is to set `DOTNET_HOST_TRACE=1` and `DOTNET_HOST_TRACEFILE=host_trace.txt` and then run the application. A new file `host_trace.txt` will be created in the current directory with the detailed information.

### `COREHOST_TRACE`

Controls diagnostics tracing from the hosting components, such as `dotnet.exe`, `hostfxr`, and `hostpolicy`.

> [!NOTE]
> Starting with .NET 10, use the [`DOTNET_HOST_TRACE`](#dotnet_host_trace) environment variables instead. The `COREHOST_TRACE` variables work the same as `DOTNET_HOST_TRACE` variables.

- `COREHOST_TRACE` - see [`DOTNET_HOST_TRACE`](#dotnet_host_trace).
- `COREHOST_TRACEFILE` - see [`DOTNET_HOST_TRACEFILE`](#dotnet_host_trace).
- `COREHOST_TRACE_VERBOSITY` - see [`DOTNET_HOST_TRACE_VERBOSITY`](#dotnet_host_trace).

### `SuppressNETCoreSdkPreviewMessage`

If set to `true`, invoking `dotnet` won't produce a warning when a preview SDK is being used.
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