adal-aad-client-credentials.cs

public class MetricsApiAccessTokenProvider
{
    private readonly CredentialConfiguration _settings;

    public MetricsApiAccessTokenProvider(CredentialConfiguration settings)
    {
        _settings = settings;
    }

    public async Task<string> GetAccessToken()
    {
        var clientCredentials = new ClientCredential(_settings.ClientId, _settings.Secret);

        var context = new AuthenticationContext($"https://login.microsoftonline.com/{_settings.TenantId}");

        var result = await context.AcquireTokenAsync("https://monitoring.azure.com/", clientCredentials);

        return result.AccessToken;
    }
}