Starter.cs

[FunctionName("ColdStarter")]
public static async Task Run(
    [TimerTrigger("* */15 * * * *")]TimerInfo myTimer,
    ILogger log)
{
    var client = new HttpClient();
    await client.GetAsync(Environment.GetEnvironmentVariable("FunctionUrl"));

    log.LogInformation($"Pinged Function at: {DateTime.Now}");
}