Sourced from Azure.Monitor.OpenTelemetry.AspNetCore's releases.

1.5.0

1.5.0 (2026-04-30)

Features Added

• Add ability to specify EnableStandardMetrics and EnablePerformanceCounters
  (#​56438)

Breaking Changes

• Default Sampler Changed: The default sampling behavior has been changed from
  ApplicationInsightsSampler with 100% sampling (all traces sampled) to
  RateLimitedSampler with 5.0 traces per second. This change significantly
  reduces telemetry volume for high-traffic applications and provides better
  cost optimization out of the box.
  Impact: Applications with more than 5 requests per second will see fewer
  traces exported by default.
  Migration: To maintain the previous behavior (100% sampling), explicitly
  configure the sampler:

// Option 1: Set SamplingRatio and clear TracesPerSecond
builder.Services.AddOpenTelemetry()
    .UseAzureMonitor(options =>
    {
        options.SamplingRatio = 1.0f;
        options.TracesPerSecond = null;
    });
// Option 2: Use environment variables
// OTEL_TRACES_SAMPLER=microsoft.fixed_percentage
// OTEL_TRACES_SAMPLER_ARG=1.0

Bugs Fixed

• Fixed an issue where Azure Container Apps instances were showing VM instance GUIDs
  instead of replica names in the Role Instance field.
  (#​54586)

1.5.0-beta.1

1.5.0-beta.1 (2026-04-28)

Features Added

• Upgraded api-version tag from package-2024-05-01 to package-preview-2025-06. Tag detail available at https://github.com/Azure/azure-rest-api-specs/blob/main/specification/appconfiguration/resource-manager/readme.md.
• Added AzureFrontDoor property to AppConfigurationStoreData and AppConfigurationStorePatch to support Azure Front Door configuration for a configuration store.
• Added new model AppConfigurationAzureFrontDoorProperties with a ResourceId property representing an Azure Front Door profile resource ID.

1.4.2

1.4.2 (2026-04-28)

Other Changes

• Upgraded dependent Azure.Core to 1.54.0.
• Upgraded dependent Azure.ResourceManager to 1.14.0.

1.4.1

1.4.1 (2026-04-27)

Other Changes

• Upgraded dependent Azure.Core to 1.54.0.
• Upgraded dependent Azure.ResourceManager to 1.14.0.

Commits viewable in compare view.