How to opt out
The .NET Core SDK telemetry feature is enabled by default. To opt out of the telemetry feature, set the DOTNET_CLI_TELEMETRY_OPTOUT environment variable to 1 or true.
A single telemetry entry is also sent by the .NET Core SDK installer when a successful installation happens. To opt out, set the DOTNET_CLI_TELEMETRY_OPTOUT environment variable before you install the .NET Core SDK.