Change return type of method 'FilterMeasurements' from 'System.Collections.Generic.IEnumerable<CentralHub.Api.Model.Measurement>' to 'System.Collections.Generic.Dictionary<CentralHub.Api.Services.LocalizationService.FilterCriteria, CentralHub.Api.Model.Measurement>.ValueCollection' for improved performance (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1859)

Possible null reference argument for parameter 'source' in 'Tracker[] Enumerable.ToArray<Tracker>(IEnumerable<Tracker> source)'.

Nullable value type may be null.

Change return type of method 'FilterMeasurements' from 'System.Collections.Generic.IEnumerable<CentralHub.Api.Model.Measurement>' to 'System.Collections.Generic.Dictionary<CentralHub.Api.Services.LocalizationService.FilterCriteria, CentralHub.Api.Model.Measurement>.ValueCollection' for improved performance (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1859)

Possible null reference argument for parameter 'source' in 'Tracker[] Enumerable.ToArray<Tracker>(IEnumerable<Tracker> source)'.