public class HealthCheckHttpTrigger
{
    ...
    // Dependency injections here

    [FunctionName(nameof(HealthCheckHttpTrigger.PingAsync))]
    public async Task<IActionResult> PingAsync(
        [HttpTrigger(AuthorizationLevel.Function, "get", Route = "ping")] HttpRequest req,
        ILogger log)
    {
        return result = await this._function
                                  .InvokeAsync<HttpRequest, IActionResult>(req)
                                  .ConfigureAwait(false);
    }
}