WeatherForecastController.cs

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private static readonly string[] Summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };

    private readonly ILogger<WeatherForecastController> _logger;
    private readonly IFeatureManager _featureManager;

    public WeatherForecastController(ILogger<WeatherForecastController> logger, IFeatureManager featureManager)
    {
        _logger = logger;
        _featureManager = featureManager;
    }
 

    [HttpGet(Name = "GetWeatherForecast")]
    public async Task<IEnumerable<WeatherForecast>> GetWeatherForecast()
    {
        if (await _featureManager.IsEnabledAsync("NewFunctionality"))
        {
            _logger.LogInformation("Getting weather forecast for V2 API version");
            this.HttpContext.Response.Headers.Append("X-API-Version", "2.0");
            
            //Adding this extra tag allows us to track which functionality is used
            Activity.Current?.SetTag("weatherforecast.api_version", "2.0");
        }
        else {
            _logger.LogInformation("Getting weather forecast for V1 API version");
            this.HttpContext.Response.Headers.Append("X-API-Version", "1.0");
            
            //Adding this extra tag allows us to track which functionality is used
            Activity.Current?.SetTag("weatherforecast.api_version", "1.0");
        }

        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
                TemperatureC = Random.Shared.Next(-20, 55),
                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
            })
            .ToArray();
    }
 }