• Allow to set flags on event. It will be used in conjunction with the feature that will allow to keep IP addresses.
• Fix: SerializationException resolving Activity in cross app-domain calls
• [Make HttpClient instance static to avoid re-creating with every transmission. This had caused connection/memory leaks in .net core 2.1] (#594)
  Related: (microsoft/ApplicationInsights-aspnetcore#690)

• Fix: NullReferenceException if telemtery is tracked after TelemetryConfiguration is disposed
• Move the implementation of the extraction of auto-collected (aka standard) metrics from internal legacy APIs to the recently shipped metric aggregation APIs.
• Fix: NullReferenceException in ExceptionConverter.GetStackFrame if StackFrame.GetMethod() is null

• Extend the Beta period for Metrics Pre-Aggregation features shipped in 2.6.0-beta3.
• New: Added TryGetOperationDetail to DependencyTelemetry to facilitate advanced ITelemetryInitializer scenarios. Allows ITelemetryInitializer implementations to specify fields that would otherwise not be sent automatically to the backend.

• Revert changed namespace: SamplingPercentageEstimatorSettings, AdaptiveSamplingPercentageEvaluatedCallback
• Add netstandard2.0 target for TelemetryChannel which doesn't have a dependency on Newtonsoft.Json

Extend the Beta period for Metrics Pre-Aggregation features shipped in 2.6.0-beta3.

• New: Enable ExceptionTelemetry.SetParsedStack for .Net Standard
• Fix: TelemetryClient throws NullReferenceException on Flush if the underlying configuration was disposed

• Report internal errors from Microsoft.AspNet.TelemteryCorrelation module
• Fix: Telemetry tracked with StartOperation is tracked outside of corresponding activity's scope
• Fix: TelemetryProcessor chain building should also initialize Modules.
• Fix: Wrong error message in AutocollectedMetricsExtractor.
• NEW: Interface and Configuration: IApplicationIdProvider.
• NEW: Metrics Pre-Aggregation: New TelemetryClient.GetMetric(..).TrackValue(..) and related APIs always locally pre-aggregate metrics before sending. They are replacing the legacy TelemetryClient.TrackMetric(..) APIs. (More info.)

• Changed signature of TelemetryClient.TrackDependency
• Added overload of TelemetryClientExtensions.StartOperation(Activity activity).
• Finalize the architecture for adding default heartbeat properties (supporting proposal from Issue #636)..

• Fix for missing TelemetryContext. Thank you to our community for discovering and reporting this issue!
  Logic bug within Initialize() in TelemetryContext,
  Dependency correlation is broken after upgrade to .NET SDK 2.5,
  Lost many context fields in 2.5.0