custom-application-insights-metric.csx

using Microsoft.ApplicationInsights;
using Microsoft.ApplicationInsights.Metrics;
using Microsoft.Extensions.Logging;

private static TelemetryClient TelemetryClient = new TelemetryClient();
private static Random Random = new Random();

public static void Run(TimerInfo timer, ILogger log)
{
    var randomValue = (int)Random.NextValue(0, 10);
    TelemetryClient.GetMetric("My Test Metric").TrackValue(randomValue);
}