Document Dashboard:Otlp:SuppressUnsecuredTelemetryMessage configuration option

[Copilot]

Summary

This PR documents the Dashboard:Otlp:SuppressUnsecuredTelemetryMessage configuration option that allows users to suppress the unsecured telemetry warning message displayed in the dashboard.

Background

When the Aspire dashboard is configured with Dashboard:Otlp:AuthMode set to Unsecured, a warning message is displayed in both the console and dashboard UI:

"OTLP server is unsecured. Untrusted apps can send telemetry to the dashboard."

While this is the correct default behavior for security awareness, there are scenarios (such as local development or controlled environments) where users may want to suppress this warning.

Changes

Added documentation for the Dashboard:Otlp:SuppressUnsecuredTelemetryMessage configuration option in the OTLP authentication section of the dashboard configuration page:

• Configuration key: Dashboard:Otlp:SuppressUnsecuredTelemetryMessage
• Environment variable: DASHBOARD__OTLP__SUPPRESSUNSECUREDTELEMETRYMESSAGE
• Default value: false
• Description: When set to true, suppresses the unsecured telemetry warning message that appears when OTLP endpoints are configured with Unsecured auth mode

Usage Example

Users can now suppress the warning by setting the environment variable when running the dashboard:

# Bash
export DASHBOARD__OTLP__SUPPRESSUNSECUREDTELEMETRYMESSAGE=true

# PowerShell
$env:DASHBOARD__OTLP__SUPPRESSUNSECUREDTELEMETRYMESSAGE = "true"

Or in a JSON configuration file:

{
  "Dashboard": {
    "Otlp": {
      "SuppressUnsecuredTelemetryMessage": true
    }
  }
}

Fixes the documentation gap for this configuration option.

Original prompt

Document suppressing telemetry warning message on the dashboard configuration page.

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Internal previews

📄 File	🔗 Preview link
docs/fundamentals/dashboard/configuration.md	Dashboard configuration

[JamesNK]

@copilot More information available at dotnet/aspire#11954. This PR adds the new configuration setting.

[Copilot]

Pull Request Overview

This PR documents the Dashboard:Otlp:SuppressUnsecuredTelemetryMessage configuration option, which allows users to suppress the unsecured telemetry warning message displayed when the Aspire dashboard is configured with unsecured OTLP authentication.

Key changes:

• Added documentation for a new configuration option that controls warning message visibility
• Provided clear guidance on when this option should be used for security purposes

[JamesNK]

Note: This setting is being added in 9.5.2. Don't merge until 9.5.2 is released.